`yo.
`PATENT
`
`SPECIFICATION
`
`
`
`Taoentor: FRANCIS ROCK CARLING
`
`799,294
`Date of filing Complete Specification (under Section 3 (3) of the Patents Act,
`1949): fon. 1, 1957,
`Application Date: Dec, 2, 1955,
`Application Date: July 13, 1956.
`Complete Specification Published? Aug, 6, (958,
`
`
`No, B4634/55,
`No. 21809/56,
`
`index at aceeptance:--Classes 40(4), J3(A: J}; and 97(4}, 82,
`International Classification>—Goze. Hitm,
`
`COMPLETE SPECIFICATION
`Improvementsin and relating to Hearing ‘Aids
`We, Portiprioun Luowires, » British Com-
`making members, the said members of the two
`pany, of 247, Regent Street, London, W.1,
`hinge portions being connected together re~
`spectively by conductors passing through, or
`do hereby declare the invention, for which
`in a channel around,
`the frost portion, and
`we pray thet a patent may be granted to us,
`gad the method iby which it is to be per
`each side member
`supporting hearing aid
`formed,
`to be particularly described ia and
`components connected to further electrical
`contactmaking members associated with a
`by the following statement: —
`further hinge portion adapted with one of the
`‘The present
`invention relates to heariag
`aids constructed in the Jomm of gairs of spec~
`first-namied binge portions and a hinge pin, to
`tacies.
`forma hinge with the contact-making mem-
`When attempting to combine g heating aid
`bers of the
`first-nanied hinge portion in slid-
`
`ing, contact-making ensugement with the cor-
`with sapectacies, certain difficultes arise from
`
`
`
`
`the need to provide spectacte frames which
`responding contactmaking members of
`the
`
`further hinge partion respectively, and the
`fit individual users. Thus ir may be necessary
`
`te provide a nuotber of diferent sizes of
`hearing ald components supported
`by the two.
`side members being connected) together elec-
`from, a aungber of different lengths of side
`
`arms for both right and def side anne, and
`trically through the clecenical contact-muaking
`members on the from portion. ard side mem-
`bearing aid untes for right or lefk car; that is
`& large sumber of different combinations for
`bers and through the sald: conductors.
`any one style of spectacke frame. To make
`By this construction the number af differ
`ant sed components required to be manu-
`each pals of spectacles individually to pre-
`scription therefore results in unreasonably high
`factured is Hmited because the side necabers,
`cost. The
`same
`general
`problema
`arises
`Gr at least @ large part thereof, cuay be made
`although not
`to such a igh degres,
`in the
`suitable for a wide range of diferent Ftungs.
`The invention will be described by wayof
`case of a head-band hearing aid,
`Tt is the principal object of the present in-
`example, as applied, to a spectacle heating aid,
`vention to provide @ hearing ald af the types
`with reference to the drawings accompanying
`referred to which can be manufactured more
`Provisional Specification No, 21,808/56 in
`which.
`;
`cheaply than known devices of the type.
`Fig.
`1 is 9 mvuch enlarged viewin section
`Anather object of the invention ig to pro-
`aide a comstruction of spectacle hearing aid
`of part of a spectacle hearing aid according
`such that when the user needs refracting lenses
`to the tavention,
`Fig, 2 is an enlarged perspective wiew of a
`for eyesight correction,
`the spectacle frame
`part of the heaving aid with a side aritt and
`should be well adapied by its shape and size
`for ise optical purpose, and that this should
`front separated.
`the
`Big. 3 ds a view in the direction of
`be possible without the need to manufacture
`a Jarge nuntber of different spectacle frame
`arcow 3 in Fig. 1 with the side ann. ramoved,
`Fig. 4 js a view in the direction of
`the
`components.
`According to the present invention, a hear-
`arrow 4 in Fig, 1 with the spectacle front
`removed,
`yg ald in die forn of a spectacle frame com-
`prises a front portion having lens
`frames
`Figs. J and 6 are perspective wiews in twe
`different aspects of the brush-supporting block
`adapted to receive ienses (or plain glass win-
`dows) and connected bya bridge, andtwo side
`in Figs. 1 and 4,
`Fig. 7 ig a perspective view of the sly
`members,
`the front portion having an the
`rine-suppoarting block In Bigs, 1 dnd 3 and
`outer adds of each lens frame a hinge portion
`of one slip ringdetached from the block, and
`provided with a plurality of electrical contact-
`[Pric
`
`30
`
`63
`
`73
`
`a5
`
`
`
`16
`
`EW
`
`20
`
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`
`tadat
`
`43
`
`

`

`
` 799,294
`
`PANAOSORIO
`
`Fig. 8 ds an enlarged and exploded view in
`partial section of an attachment to the ond of
`@ side arm of the spectacies that is to lle aver
`and behind the ear.
`Referring to the drawings, and more par-
`ticularly wD Figs.
`1 wo & 1the spectacle front
`10 has fixed theretoa hinge plate 11, of moul-
`ded plastic, such as a pheenolic material or a
`resilient plastic such ag “Nylon,” (Registered
`Trade Mark), having two Fags ‘12 projecting
`therefrom. Inan aperture in ‘the plate 11he-
`tween the lugs
`is
`am insulating block 13,
`which ery ba of
`the same material aas the
`plate
`grooved to receive three alip rings
`‘‘hichmaybe formed dn the manner shown
`in Fig. 7 of doubled silver wire, A conductor
`is commectedte each of the pairs 13 of ends
`projecting from the silver svire loop aad is
`
`passed through a groove 16 formed in the
`Tront 20, cither above or belowthe lens aper-
`tore 28 (Pig. 2), to @ durther slip cing (not
`
`shown} in.
`the opposite Linge which is con-
`siracted.
`ig, the same way as thet described.
`The three conductors are of course insulated
`from one another.
`‘The brushes to engage the slip rings i4
`ane shown at 17. They ere formed of aire
`beat as best shown in Fig, 1 and are mounted
`in grooves 18 in a brush-seprorting block 1
`This block 19ig clamped to the and af one
`side arm 20 by a hinge plate 21 having Ings
`theteftem, The contacting
`projectingwy
`22
`
`aperture imthe plate 21 between the lugs 22.
`parte 23 4
`f
`the brushes project
`through an
`A binge piin 24 passes through aligned aper~
`tures in the lugs “12 and 22 aad jin the block
`is, A gonductor 25 (ig. 1)
`is connected to
`each brush and the three conductors, insulated
`from one another, past through a slot 26 ia
`the side arm, the slot being covered, bya strip
`27 which may be cemented in position, An
`insulating member 28 pxrevents electrical COL
`tact between the brushes 17ancthe plate 21,
`
`Fig. 8 shows at 30 the end of one side arm
`vemate from:
`the hinge,
`the conductors 25
`emerging from the slot 26 andeach terminat-
`ing ina loop 31 which is clamped «within a
`counterbored aperture 32 by a Sush 33.
`Clamping screws 34 pass frosty through the
`bushes 33 and are threaded into bushes 335
`
`set into the upper wall of a hollow cont iner
`36, each bush 35 being connected
`toa lead. 37.
`The container 36 is closed, oy ca Hd 38 and
`ds so shaped: ae ta be adapted to He behind the
`ear.
`Within the container 36 is arranged one
`anit {net shown) of a hearing ald, Por in-
`
`stance the container at
`the end of one side
`arm thay carry4 miicrophoneand a transistor
`atuplifier and the container at the end¢of the
`other side ann xiay catry another amplifier
`G# required} and 9 sound reproducer such as
`bone-conduction device os a reproducer
`adapted to be coupled to the ear canal by
`means of a short tube, One of the units also
`
`40
`
`&
`
`20
`
`25
`
`30
`
`35
`
`45
`
`53
`
`60
`
`aesAl
`
`accommodates a low tension battery required
`o supply power to the transistor amplifier.
`AL the electrical connections needed be-
`tween the two units are provided by the leads
`25 im the ewo side arms und the leads con-
`nected to 15 passing through the front. Owing
`to theslip rings and brushes in the hinges, the
`side arms audfronts can be assembled tn the
`
`same way as normal spectacle frames, no
`additional skillbeing required, Similarly stan-
`dard hearing sid units can be Stted within
`the containers 36 and all the electrical con~
`nections needed to These units arte made auto~
`matically when the gscrews 34 ave inserted to
`fasten the containers to the ends 30,
`WHAT WE CLAIM TS t=
`LA hearingaid in the foro of a spectacle
`frame comprising a Front portion having lens
`frames adapted to receive lenses (or plain
`glass windows) and oconaected by a bridge,
`and two side raembers, the front portion hav-
`ing on the ouser side of cack lens frame 3
`hinge portion provided with a wluxality af
`electrical contaci-making: members,
`the said
`members of
`the two Hinge portions being
`reonnected, together respectively by conductors
`passing through, or in a chauneh around. the,
`trent4portion,and each side member support
`ing hearing aid components commected to fur-
`thee electrical contactamakime mecibens aeso~
`eiared with a further Ainge portion adapted,
`withone of the fist-nemed hinge portions and
`a hinge pin, to fomm a hinges with the contact-
`making members of
`the firs-mamed hings
`portion in gliding,
`conmctmaking eagage-
`ce
`ment with the corresponding contacemaking
`members of the further hinge portion respect
`ively, anc the hearing ald: components sup
`ported by the tio side ‘members being ©
`nected together electrically through the elec
`trical contact-making members on the
`portion and side saembera and through the
`said conductors.
`2, A hearing aid according to claim 1,
`wherein the contact-makin2 gienibers of one
`Ringe portion are in the fonmof slip rings
`wad those of the other hinge portion are in
`the formof brushes.
`3 A hearing aid, according to claim 2,
`wherein the clip tings are aisps sed in grooves
`in an insulating block which is held) in poul-
`tion bythe bings pin.
`4,8 hearing aid
`according to claim 1, 2 or
`
`3, wherein the fi atingald“components aup-
`
`Betted by one side anm comprise 2 micro-
`phone and those supported bythe other side
`ama comprlee a sound reproducer.
`5, A hearingaid according to any of the
`preceding claims wherein the hearing aid
`components associated with each side meti-
`ber are mounted within a casing attached as
`& rn to theside member.
`& A hearing ald according tc claim 5,
`wherein the unit is attached to the side mem-
`ber by eneans of scrows which
`serve also as
`
`ao
`
`nSSy
`
`&
`
`a5
`
`30)
`
`95
`
`190
`
`105
`
`i260
`
`hank wn SB
`
`120
`
`136
`
`ba
`
`

`

`
`
`10
`
`tet
`
`i
`
`20
`
`23
`
`a9
`
`33
`
`45
`
`a6
`
`oo
`
`esociated with further hinge portions adapted
`
`further electrical contactmeking means
`we
`wvith the firsi-named hinge porttlong and a
`the heariag aid
`hinge pin, to form hinges,
`components in the two ade members being
`connected rogether electrically through the
`electrical com creaking means on the front
`
`portion and side member andthrough thesald
`condnetars.
`Accondlag to a feature of the invention the
`hearing ald components in each side member
`pugettherwith the hinge portions andelectrical
`ountactinakiag means associated with that
`side member are constructed as a unir slidable
`within a casing.
`By this constuction the munrber of differ
`ent sized components required te be manu-
`factured is linvited because the side members,
`Or at least q lange part thereof, may be made
`
`
` 799,294 3 .
`
`
`eed
`means for making electrical connections be-
`fore described with rederence to the deanvings
`tween the componente in the unit and the con-
`acooipanying Provisional Specification Ne:
`ductors in the side member.
`ZLBOo/56,
`7. A hearing aid according to claim 3 or 6,
`avherein the salaid anit iy adapeed to Ke dchind
`BEDIME & GROSE,
`
`the earof the user.
`Agents for the Appl
`’
`6, Beeam’s Buildings, Loadon, E.C4.
`8 A hearing aid substantially ag hereinbe-
`PROVISIONAL SPECIBICATION
`No, 34634 A.D, 1955
`improvements in and relating to Hearing Aids
`We, Porrrpnons LImMiteo, 2 British: Come
`suliadle for a wile range of different fittiags.
`in one embodinaent“of the javention the
`pany, of 247, Regent Street, London, Wl
`front portion ds af metal, which amay be
`do hereby declare this invention m be de-
`scribed in the followingstatement: —
`covered with plastic, and ds adapted to be
`The present
`invention melates
`to bearing
`opened: for the insertion of denses for plain
`aids oomstructad in the form of paira of spec-
`gisss). Tr
`is ako
`provided with a mbe or a
`
`tacles,
`channel extending from one aide to the other
`
`
`Te ordey that euch devices should be manu-
`to accommodate a Ene esble which
`mag be as
`
`described in the specification of co~ nding
`factured at 4 reasonable priceic is necessary
`that the number of different sizes and shapes
`Application Ne. 9445/55, Two twin strands
`
`of component parts shouldbe as small as pos~
`of such cable may be cemented together to
`
`form. a founcone cable,
`sible, Another requirement
`ig that when the
`
`user necds selzacting lenses for eyesight cor-
`Gn each side of the front portion are four
`matually-insilated: metal eyeletets, which may
`rection,
`the spectacle frame should be well
`
`be rhediseea
`tated, arranged tc form elements
`adapted by it shape and size for its optical
`
`
`of a hinge, Each eyelet is commected to one
`purpose, and that this
`should be possible with-
`
`ofthe cable core
`out the need to manufacture a large aumber
`of different spectacle frame components.
`‘The construction of each side mentber may
`‘The invention has for its object w provide
`be likened to a dagper in dey scabbard, Thus
`a spectacle heariag ald in which the require~
`at comuprises, as the blade of the dagger, an
`elongated chassis bearing components of a
`mente set forth can be met more readily then
`hearing aid which mane Include q transistor
`with known heantng aids of this kind.
`amplifier. The hilt of the dagger is constituted
`
`Ascourding to the present invention, a hear-
`ing aid, in the fonn of a spectacle frame com
`by a block which in one side member accom~
`prises a front portion having frames adanted.
`modates a microphones and in the other side
`seetiber accommodates & sound reproduver
`to receive fenses (or plain glass windows) and
`and) a battery. At the tip of the degger are
`connected by a bridge, and revo side members,
`three eveleys“ofnylon which interleave with
`the fromt vortion having on the outer side of
`the eyelets on the fron portion and fomm
`each fens frame g hinge portion provided with
`hinge, A nylon binge piemay be used. The
`electrical contactamuking mieuns,
`the two said
`
`nylon eyelets are provided on their four inner
`means dDeing connected together by conductors
`aces with wire sings or wipers thereby
`passing through, or it g channel around, the
`providing slectrical contacting cans enBRE
`frome portion, and the side members accom-
`modating hearing ald components connected
`mig the condncting eyelets Gn the front por
`tion actingag slip-rings, The contacting means
`are electrically connected to the hearing ald
`caponents,
`The dagger blade is dlidable fate a scab-
`bard, open at both ends, and formed for in.
`stance of
`imitation torteise-shell or -a Light
`metal aHoywit 1 an anodised finish. W!hee the
`
`
`lade ds im position within the scabbard the
`Ringe elements project from. tts front end, Th-
`dagger thay be held within the scabband b
`two or three reteening SCROWSE..
`
`Tn order to di assemble the device described
`
`it is only necesar: fo temove
`for sexvicing,
`the hinge pins and the retaining screws and
`
`gull the dapgers out of the scabbards, There
`are no wires todisconnect,
`Moreover i: is an easy: matter when fitting
`a wer to select g suftable front portion amd
`combine this with sutable side members, Ne
`
`80
`
`SS
`
`100
`
`110
`
`iis
`
`

`

`
`4
`999,994
`
`AAnaaLaaneerarritraatgnnranrantrnenrartyNR,
`
`great variety of paire of side members are
`neoded. and the dagger portion of afl the right
`and ail the lef: side members may be the same
`for all sizes.
`Farions steps may be taken to avoid: sell-
`oscillation due to “ringing vound.” Thus in
`stead of the metal eyelets on the front portion
`
`eyelets of a soft material, such as polythene,
`may be used. Suitable conducting washers may
`be provided on the surfaces of the eyelets to
`
`ship-rings.
`Jt may for the same reason the desizable
`to evake the blocks containing the microphone
`and sound) reproducer of soft material, such
`as polythene, and tw make the contact be~
`tween the blocks and the scabbards as Ughr
`and tenmious as possible, Bor
`insiamee che
`REDDIE & GROSE,
`blocks may be so designed that
`there is 2
`Agents for the Applicants,
`very small contact area between them and the
`6, Bream’s Buiklings, London, BC,
`scabbard or the joints between the blocks and
`PROVISIONAL SPECIFICATION
`Wa, 21809 AD, 1956
`improvements in and relating to Hearing Aids
`We, Forrieuone Lamrren, a Briss Cor-
`jug through the said structure, wherein each
`of the said untts is detachably fixed to the
`pany, of 247, Regent Street, Londen, W.1, do
`i
`hereby declare this invention to be described
`said structure by means of two or more screws
`
`
`which also serve to provide electrical connec
`in the following statement: —~
`The present
`inwention relates to hearing
`tions between the said leadg and circuit ele
`
`is
`of a type adapted to be supported upon
`asents of the tits, The circuit elements in one
`the head of a wer, for example hearing aids
`or both units include an acaplifier, which may
`et
`be a transistor amplifier,
`into pairs of spectacles or inte head-
`Tn the case of spectacles the units thay be
`saounted within dhe parts of the site arms
`behind the ears of the wearer, Thus with thé
`aid of the invention ir le possible to stock side
`arms of various lengths and spectacle fronts
`of warious sizes andstyles, andto ft standard
`Rearing aid units in al] of
`the spectacles
`asserabled from any of these parts.
`The side anne of spectacles may be hinged
`to the front by hinges embodying slip oings
`aad brushes and the present invention.’ also
`provides a preferred formof such hinges.
`‘The invention will be described by way of
`example, as apolled to a spectacle hearing aid,
`with reference to the accompanying drawings
`in which
`/
`ag. Lis a auch enlarged view in section
`of part of a spectacle hearing aid according
`to the invention,
`Fig. 2 is on enlarged: perspective view of &
`part of the hearing aid with a side arm and
`
`front separated.
`Mig.
`3 ds
`a view in the direction of the
`arsow 3 in Big, 1 with the side arm, removed,
`Fig, 4 is a view in the direction of the
`arrow 4 in Fig.
`ij
`i
`with the spectacle front
`removed,
`Figs, $ and 6 are perspective views in two
`diferent aspects of the brnsh-supporting block
`in Figs. ft and 4,
`7 is a perspective vicay of the slip ring.
`:
`a
`4
`‘,
`+
`2
`4
`m~
`5
`5
`Fig. 7 i
`supporting block in Figs, 1 dik 3 and of
`
`Whenattempting to combine o hearing aid
`with spectacles, certain difficulties arise Toom
`the need ta provide spectacle frames which
`
`fit individual users. Thus ic may be necessary
`
`to providy
`some twelve differentsizes of front,
`
`
`some five
`diferent
`lengths of side arm for
`both right andleft side anns, and hearing aid
`wolis for right ar defy ear:
`that is abonr 240
`different combinations for any one style of
`spectacle frame, To ovake each pair of spec~
`tacles individually to prescription therefore
`sesulis in uureasonably high cost. The same
`general problem arises, although mot to such
`a high degree,
`in the case of a head-band
`hearing aid.
`;
`it is the principal object of the present in-
`tention ta provide a hearing aid of the types
`teferred: to which can be manufactured more
`gheaply
`thes known devices of the type.
`According s the principal feature of the
`invention, there Is provided a hearing aid of
`the type referred to comprising a sappering
`structure adaptedto pasa across the head from.
`one side thereof to the other and a hearing
`aid unit mounted upon the sald structure at
`or mear to each of the two ends thereof, one
`such unit comprising a microphone and 2gso-
`claved circuit elements, and the other unit
`comprising a cound reproducer and associated
`cinculr elements, and the necessary electrical
`connecting leads between the two units pass-
`
`oeSsP|peet
`
`the scabbards may be lined with damping
`eaaterial, such as flannel. The scabbards may
`be moulded in a material cuch as nylon or
`polythenereindorced with metalstrips which
`dp not, however, extend sufficiently far te
`vouch the blocks.
`
`The so-called “ ear-ourls * of the slde mem~
`bers which rst on the ears may be in the
`fora of extensions of rolled gold, as in many
`normal spectacle frames, or of a formable
`plastic,
`The cross-section of the skle members may
`be Veshape, with the apex, of the V down.
`wards, at least in the region where the side
`member rests upon the car,
`in order to ine
`erease the comfort of the device.
`
`a5
`
`30°
`
`35
`
`RG
`
`i)
`
`100
`
`105
`
`Lio
`
`BSE
`
`20
`
`i5
`
`20
`
`40
`
`43
`
`58
`
`1STH
`
`6B
`
`65
`
`7
`
`23
`
`

`

`799,294 5
`
`
`
`
`
`in @ counter-cored spertuge 32 iby a bush 33.
`Clamping screws 34pass freeely dhrough the
`bushes 34 and are threaded inte bushes 33
`
`set into the upper wall of a hollow container
`36, each bush 35 being connected ta q lead.
`37. Che container 36 is closed by a lid 38 and
`is so shaped as to be adapted to He behind the
`ear.
`Within the container 36 is arranged one
`8)
`
`
`it (not shown) of a hearing aid. “For ine
`stance the container at the end of oneside arco
`may carry @
`saicrophone amt a transistor
`amplifier and the contidner at the ead of the
`
`other side aren, Tay CaXTY anether amplifier
`GE required) and a sound seproducer such a!
`8 bone-conduction deving Or a reproducer
`adapted tobe coupled ia the ear canal by
`means of a short tube, One of the units also
`accommodates a low tension battery: required
`
`to supply power to the transistor amplifier,
`All
`the electrical connections needed be-
`
`tween the two units are provided bythe le:
`25 in the two side arms amd the feads con-
`nected to 15 passing throagh the front,Owing
`
`to the silp-rings and brushes in the Hinges,
`
`the side arms and: fronts can be asserabled fa
`the same wayas normal spectacle frames, ao
`additional
`skill being
`required. Strmilarly
`tandard hearing aid units can be Beted.
`within the containers 36 and all the electrical
`connections aceded % these unls are made
`automatically when the screws 34 are inserted
`to faster the containers to the ands 30,
`
`Ta the case of a head-hand hearing aid, the
`
`eh
`two hearing
`aids may be attached to the tivo
`
`band through which the neces»
`sary
`connecting leads run, Connections be~
`tween these lead3 and the ewe units are made
`
`in the manner described: with reference to Fig.
`8, That is te say the hearing aid units are
`atiached to the head-band by means of screws
`which also effect the necessary electrical con-
`nections.
`
`one slip ring detached Irom the block, and
`Fig. 8 ds an enlarged and exploded view
`in partial section of the end of a aide anm of
`the spectacles that is wm He over and behind
`the ear,
`Referring to the drawings, and onore par~
`ticulany to Figs. 1 to 6,
`the spectacle front
`10 hag fixed thereto a binge plate
`11, of
`moulded plastic, such as a phenolic material
`or 8 nesilient plastic such as “nylon,” hav-
`ing twe jugs 2 projecting therefrom, In an
`apertures dn the plate il between the lugs is
`an insulating block 13, which may be of the
`
`saitse material as the pe LL, grdoved to tee
`ceive three alip rings 14 which may be fomned
`in the aianner chownin Fig, 7 of doubled
`silver wire. A conductor is connected to
`each
`of the pairs 15 of ends projecting from the
`sliver wire loop and is passed,
`through a
`
`groove 16 formedin the front 10,
`bove
`or below the lens aperture 29 Fig. 2},
`to a
`further slip ring (got shown)im the opposite
`hinge which is constructed in the same way
`as that described, The three ccaductory are
`of course dasulated from one another.
`‘Phe brushey to engage the slip rings 14 are
`shown at 17. They are formed of wire bent
`as ‘best showa in Fig.
`1 and are mounted in
`grooves 18 in a brushsupporting block 29,
`This block 19 ip clamped to the end of one
`side anm 20 by a hinge plate 21 having lugs
`22 projecting therefrom, The contacting parts
`23 of the brushes project shrough aa aperture
`in the plate 21 between the luge 22, A hinge
`pin 24 passes through aligned aperttssres in the
`tugs 12 and 22 and in the block 13. A con-
`ductor 25 (Fig, LDis connectedto each brush
`andthe three conductors, insulated fram one
`another, pass through « slor 26 in the side
`arm,
`the slot being covered by a strip 27
`sshich aay be cemented an position An ine
`
`sulating member 28 prevents electrical con
`tact between the brushes 17 and the plate 21.
`Fig. 8 shows at 30 the end of one side
`REDDIE & GROSE,
`arm remote from the hinge,
`the conductors
`Agentsfor the Applicants,
`3 enierging from the slot 26 and each ter-
`8, Brean’& Buildings, Londos, E.C4,
`
`
`guinating in a icop 31 which is clamped with~
`Leamington Spa: Printed for HerMajesty's Stationery Office, by the Courier Press,1952,
`Published at The Patent Office, 2 §, Southampton Buildings, London, W.C.2, from which
`copies may be obtained,
`
`33
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`69
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`65
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`799,294 provisiona. specification N° 218092°
`SHEETS
`this drawing is a@
`reproduction of
`the Original on a reduced scale.
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`| Fig t
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`2 SHEETS
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`7392q4 PROVISIONAr SPECIFICATION N&2}20986
`This drawing i @ production a
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`SHEETS
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