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Tffi CRNRDNN RRDM RMRIEUR$.IURIIft.

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,At{uatY t9!2

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VE3YR(ING MLIIAM AXD IIUGHSON STS,

HAMILTON ONIARIO

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SI{VIlJIflEP"l'la.t 4,,o,n/,1,1 .a

Tl[ ciltflillt Rilt0 uvltll|]ns'n]ililgd/ha - 6le&i& tol', ACaAO

7d,1'L Ol eoaf2ah

JANUARY. 1952

VE3WO_86 INVERMAY AV',, W]LSON HEIGHTS,TORONTO, ONTARIO

UIIIVEns[r cABPANTS

IIIET

PUIIGIIEII G[[S$IS

I

IAMMOI{II MIIIUF[CTU[TIE GllMPTI{Y I,IMITEII

SIf EE{\f SPrE o. rL (lurry. a.Ebc ii ]|f ot rLe

big6tb*6@irh*dycitynbdc6,

jst dor {dy ro go,

tui.r !3 5"Edr i.aryd.s *i!tl ( te Pa3t

5P4t.4.I/orcMdedIirty &ILs lor @Eri.1 to d! bB Ln &6tr job. b is oE of thc pqri3tqt 16. i

'iqlc qFdot o. d.,isans

; *r *.rr r- L*

Loc"it.*atrakt-d,rcs'{duu"t

em;endy dairabl. ro hr'. a naks ehichw6uld sirc in unisrakabr. i.dicaridn ofuicbod.de. As far !s rh. cw dlh6ia* nom.m.d, h€ i5 uri[.ly b run our oI anyof rh. (ommun'c:rions b3nd3 .^c.Dr a ln.loe-fftq&nc, end, and the ronDab h!.monic r.larionships vhich exisr DaIe ft a

thoroulhly rftci.dang.d ro se(e ror all bads.

ApM from, valE mounrins and a couDleot r*nroR. rh. only eDFDeDts neded

'rerh. f*ouency ofxoolc, Both th* nm.,m '.d " '.;ii*pmrEry obein,bk rrch sDrE dtrG.Tto cirm'r d,ssrsm R Fven F,g r, andaltnongh n a r:kry $eI ntf{rptm,'ory,

SUrtltrtau

BAND EDGE MARKERWitLsual IndicatioD

,r, H. M. HUMPHREYS

1V166. d.!".r-"6kd b;d-' " vFo "6knri,l it, Ersombl. nlibci ofconr&Bwhile .h. elf+xcird

o$illaror has the dvrtrras. thri ii crn b.adjuned cilhe. ro the frqxenq or the czrlbcing hcard, or ro a clenr sNl on rh. banditacQ is onr.mplar.d, n rho har rh. Ferdavbick rhrl n is an roo easy ro !!ay ou6id.tlr band m onenc. *hich rh. cPo nMd.Brood ro i.v sirh grave disDr6uE !

rioe rqnir an aEpmv.d requ.ncy e.r.rb h. t pr a,., 4r,r' d a $arior vhdc variabl.rr.q.hry entrcl n dDbr€d does DorenriEly sorvc the DrobLm, fo' .d.i.l ia$B.D6r:& good inrenrio.s, dial! tu b. Mdir@@dy, epeially vtere saduirioro nrion cha s ar asily b. njsrcad i oscillarorcc, 30 of calibarioD qnft. un xp6t dl,lmd li{, bu. fi, frcm lsn, is rhc fEilry orhDan naturo, *l$ch usually rums our ro b.ar ib wak6t wh6 lnd. i! a pGibili.y ofbrgci.e some Erc Dx. Th.rc n sericmDh.ion b s*i4 rh. \rFo b Pftnin i r*hnndEd cycle ol ao-bqr eirh rhat uunalell sisr, md to h.q on aFbdy wirhthe hoFe of b.aling all o$einon b 3 snarp,rcply imediar.ry rh. cQ .ods. rtr such

Dobt ir uually po porcd uDtil o @rEd ntunny elablkhed, on .be assnpton th,i rh.auroinaiic ch.ok agaiid rhe oihd shrion!.isnd: n su6ci@l esuEne ol haiu io rhecv.lin rcsing phL cEw *ho prsu@blyhav. no h6i61ioD ir addirs the ninor otreneor op.ratj* ourside ue r@pied arateurbands io th.n najor crime ol6cing on rhc

I1

ti:;, :

i! f.s hinc on adiBhc and oDerdio. nay

A 3.5 mcq al is usen ri CllEVU, bEca6e.he vFO in e oler.rd in !h,t band, doublmb.j!s incluiled j. .bo *ite. ro giv. outptrbd 7, 14 ed 23 mc 6 w.11 cs on the rurdr-

a 7 or.v.. r l4mc oy al sho.ld not bc$trt'tor.d at *ill, and no dou6t hlnyEnnts {ill sulsBt themsclves to thcapaifficr. Thc lin.ipL or $. cimir iscnishdo ,rd. Tho cryllal, shich is not in

has no tquec.ys !ol. purpos bcins roeuy

'h. qe or rhe indi.itor rub. ro .ror

Bjllrlinc ai !h. en; fl.quhcy as is oMtund@.lral. Th. &s@ o[ couplins igla r citisar{oi erc.Driomlly $. bu! .holinl drurd be aqjusbd $ thd tno oyo i.aloo$ fully clar.donplibg h '.r loos. lhc opoing of rhe ey.hay b. found io vary slishdy ar points *cllofi r6oDane tr rhe rFo tuDi4 mrkol k

SUSMIi{IATUIE CONTNOLS

rnr!. b fioc oid;!o !i L B.

comFlerery I rhe coupling is in ea*d to rh.optinum, aDd in any ovent is noi likety io bcmnrused *iih $e indi.arioi ol reso.ab@,

iJm erial vhdhe rhe mdL€br n.ouokdro,rE lrmErv o 6nDg mddd,ne oi*.vFD or ro rhe amde @iior a tuoed bufldsacc, as n bar a nesrisibt. d4frpins eflst.The HT and LT dnands of rh. rub. aE so

ilmos invaii*lv h.suplied by rhe \rFo or dcn r po*er pa;k.

Tr^.letrcn bte rhould be mounred snlrl,. cr. through. hol. in rhe panct as closoro rh. vFo r iis dilt N po$'bre snd live. rlen lisual$, ing olspprorch'ns dansas 'h. o!.raror lBE rhe b8id .dF,

Whnc ft. srarer eNice can be obirinenlrofr thk circuit by Ei4 n ar a tand .d&indicaror d mohm.nd.d, n can also bc $drirb any dyial which tho red.r nay Dos6rro sive a spor ch.ck on rhe $ribmrion ol

v+

Regeneration InSuperhetsMelhoils of ImDroybe ReeiverPerformanGs, A. D. oI;ELLA ITHOUGU lcacneraron tr nor

11ravoured br ;mnercDr rea,vc.de\ipe6 it h oflen ihe non eonomtrtrtdd osaionalry rhe bei tray otrmpror nqpcrlorman(e, andinErcned in,ny cl(trjr eni.h Dromres somu(h ror so lrrl.. The wnkr $ho r n.oxc.ption, has expended a .;nsiderabt.dmoun of rimeud.fro inendqvounnproeyr.cr a Iu quarl orNrrormao(e iionivariou\ pi0ts!ized !ircuits, and b€ss lea\Gro record !eaJin conclus ons 'n rhe hopcrhrr rhey may be oriurere!.

One ol ihe mo* Enfkable €epls

sLwir.

@?rion is slom br lhe amu-.!.toid obEirabL in rhe limple

- a DEr Edakn thousands ol*.oir . b. aooffi.d iumcrentlv.t.i&rasa to op.ra& a lair orb€d-rb, Urfon@eln

- &.cb. dui. *herc a few ESICOI

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-d.b. '.ft inprovemdr io suD€r-hEdvE Efornu* h doomed r.l-e- b*;uk the b.nents ob@inedrbr, dons oitler thinss oi ltc sh'mgrh

-lL wi!.d si8ral, f overall amplif-.-.., dd lbe l}T. ofderecror used,fE oos favoumble colditidns @r- rt Gv-O rccciv€r wh.re Hcrion is@rr.d to .he ntsl luned circun ud low-H suaE law dererion EemDlored lnrh d of thc suerhel if ..dion is-rDdu.d ar o loq-iilv.l D:[l orthe ck(uitn @y degdde the siEalto-noi* B!io.-^r a hisb-level Doint ir conlcG littlcbr.fir dd is subjec! 10 blockins by strotr*iglals. In 6o1t c6es ir rais circliriopedd(e1 @.esikLincc e ilirnabililyi !o b€ avoided. ed bv rhe rine ih..imiLh6 bcn B;ed. o is Rminded olrlE lMiltu roundal'ours ,nd *uin!(q*wr, by careful tt*isn it is posib-leb inprorc rb. p.rlormd(e of UF simpl.

Electrlc Soldering lronsPENCII IROX Cdt No. 61

PIII+OII{I IIGHT-ANGLErEl.l(ll noN IoLDETNG lno|{

A rishrw€i8hi (21, oune), lo"rhe ncr drlicre $ derine oErarion,.Ehnent on$rufr'on n or GEe ronq-dfiy ty,a utd m Eslco McEi:lnone. Hrndle tnErarure h€ver hEh.cr ihM bod! E;EanF DnhPidof hmd. t'. nF ,rr,bh m r+ips 4F B.l' dE.. ov ndN'nrj rvE a-h"rir, *ra4ni en.rF'nrj ryB cr" dra. bmr oo d.sB, !idr !.n.ir.ril€ pornr. R.Pu.

loris. May b€ obu,ned ,n hichg.hr*J h d.idrb<

,., , ^;

,.," ,.-. ,"",.""

F(]IF-D.LLF .onbiMrion nntil it(omDarcs virh rse vs! navinE an RF

It is_ rhe ffirei! .xperier. rhatE!ener:".n s bdL inkodu.ed at lic@;li.q Do$rble Doinrr lh..,ru,1I.. forurc.ombinsrion quokd above ,he mixerdid, The usual w.v of acomplishins thhE bv imenin!a small f.edb&l coil in rhcdoite v h viriation or miw sin ronr.!'d. c.ntrol- but a lntle EA( on diellos.s rwo innei.nt disdveraees or rhis

In Lhe fiilt Dlace thecontrolstid ofmo{freoueftv chuRts 6 o@rarod Cl6+Aand the chadcreristicallv smoorh .ontolol lne leakv Frd debror will b.lackinE.Sccondly. f@u.n!y .hansd aE trorori'oudr no6y and ro feed back rrom dod.!o !i'd tr ro fc.d b&k noie dd sisial ir4u-al oroionions. resultins in prkrie h. dssraded siEnal lo n6is ralio.SeDaBt. Regener.tiotr St stIi hovclel regeneralion is p.oduced bya rdd,are low-norF vahe us ns lh.lerkv*rd sykn or conkol rhen nerth.r ordese disadvanBEes rh6uld be Dresent. andjn rheory the lmit ns raluc of rhe s sial'n.n.'s rario would be rhar or rhe lor-nois vahe. Fis. I shows rhe RF md ofthe Mner's rceivs shich us d EFl6to Drovide rcceneiation. The imprcvemdrin n.rrorndce n .onsiderable. oEall*lc.Uvnv and sisar.Lo.no& Etro arc

the bcEse in *nsiiivitv is nost na ed. while inarcink;lerence n.o picuous b, n! abn'e.Trklus !roblem are ofcouEe nagniEed,!rmor rh'n.ne bsd is to b. cot.ild thecoil.mu$ be carertdlv woun4 dd.irherienaa,e RF trimmer or slow_moLionh;nd{eL condenser is elsnrial In rh.cftunshoM. rhe rwo 5 #F bddlPrcadcond@6 are g ged, dd w'rb drlcirrelenerarion the *l{nvrtv E 3t(b ri0t.rne

i. mdntain trackine over the rclililelv.rrow amlGur bands. Itere lhould be,n :bsolure nidmum oi 'Punins'I;Lwen Rr and oscil aror unins, sd in

this lcsBt conto,-grid inj4lion shonldb._ avoid€d, ehile AVC lpDlicd 10 th€mirer may carse d.toninc or insubihydre ro vadadon olval\e inour imEdue.

In niey olthis fornidabte lh. of"dot"k as well to coNiderseriouslv fte alrcnntiv. of addinc aconvenrlonal runed RF sGge, ud-d.dqision will to $me errent deo.Dd on thesba..and eouiomdtavailable and on rh.lyF olcircuit, In most Mdye6 thero i3roon to add a nidgel RF Denbde odlrinn€r. thouqh a sr ofswnch.d coils odgangcd runing(ond.IM misr De*itrcmaior studual alr.Bliotr5.

Tudiis Dow ro th6 IP ampli6.!,,eFedriotr cm con\enidrly k arDli.dnrc by d.lib€ra,.ly frrkins rhe amplinermnnbb: a small(aoa(irv ol I or 2BFbelwen dode dd srid is a simDl. ddef,cctive meliod, AlLDdrvely, it tt e costoa the re.ivd nusl t *.rr s low asDosibl., us lb. addg.mmr of Fi8. 2dtr b. kdm.nd.d. In rhis circun a6SJ7 conbircs tie luncdons of d€tecrorand fc.dback an li6.r, wirh a bDD€dBFo coil rcDl&ias t!. s4ond IF traFlormer. The. comalions .rc as sioM,qirh the mdjbrity ol rums in $e uodecircutr of the derdor ed dE pl.re ofrhe 65(7 etreriyely booed doM rh. milud rhu! looling inro a fairly low im-mde.a Thh n onmanlv a Dre.aulionas.nn pEmarr. oscilla on of rhe IFamDli6er -hd th. EE6.ra1id conrol is,dvd..d but also. D conluncrion silhrha low valuc of eid l6k, 10 ,6@ thelkeljnood ol Dullins dd blekins of tleos. laror wbd E.nrg CW sknakRqrified ourput is Ekr! from th.der(brrid. d und.lrrd AvC may be ob-rained rrom the se Doint il so desired.The lemainder of tb.:icu( compnses aconvoUoDal AF stase leedins a caLhod.Iolloqer. Tils combinaLioo providesamDle cain dd elihinates rhe oulpurtransrorner. bur a hiih noDc DenrodeDay be subslilut.i at some incGas in

SLYrirg

J1

;,

"; ,. ..*-,- -* ," ." ,.

i'46e6iion in audio fre{udcj, slaE6ba litde 10 i*ommdd it, a it rsulls ir ash.rDl, leaked rDoor havloc a loncnnsns rime. Thi! rends to sfroorh oxtEDid cha&.s ir amrlitude and causes.llbu! lhe slowesl motre cha.elcrs to tubs.ther A lertcralEmativ. i! the us oI. 6lre! Droducinp a reie on slot in theaudio rdqq i.to which inierferinE CWriSnak c@ be boved by o@s ot $c

In co.ctusion, for rhe .Bateun ylod6ir* a lov{ost rceivd having abov+areraEe Frfornod, the circuits ofFiE!. I md 2 6ay be suc,rssfully combined.Since spke is Drobably tne chrriDaslconnodily in amdeu! Bdv.r, rhevanous naEes should noi b€ q*&drog.the. i dd norc rhan a66Ee carerhould be rako ovd mecheiel detailFmoyins whq selechvir] R hGn,

ln lho oriaind modol oo s@ial Dr-dntions ftr Lk6 as r€gs . seening,bDt 1oo much is berler &m 1oo liule ddil is sinDle. to inst l befoE viring-lprbd sie]mr&. Th.E sh.uld 66 notr&4 of hmd caD&ity DrovidinE 6 [@dent cometion is bade" and ey

Ttble ol Vd@

Eodulali.tr lum shorld submil io Ihecorvdlional d€at]@t ol a 0l /Fcotrd.nser bel@n €c! 6id€ of rhc mainslra.fofter Edmry dd a .

More on AudioFilters

TIRoBABLY oi. oI rhe mcr inGr6ringf d-(roomrnB or@d moirhs b

'h. Dx

oro€ror has be. rh. us oraudio 61t.6, Tho

su.h fite6 wd. . farur. of 6dio e.iv.u oli bygom ua md s rar * amd.us i6 @n-

out of favolr vith th.intunudion and .volution ot sinsl+sisn3lpdhca si.h rhcir c,'ynal 6lr.B. How.v.r,.h. $rerivily @.pr.d en ro fin€n yc s .gok hardlv.noud for io-day nnd,grially forihe cw oFrator, di$rimiiarion n..str&d jn,r,r ol cycl.s is requiri, Aldio filrcB acaprbro ol giviis rhis d.grc. or sleriviry andrh.k use would Drobably b. noE conmon-Dlae now it rh. najorny ol amareuB @lisdhow simpL rhey ac ro deisn ind build.

Ardio6lreEmavb.on.oatsotFs. FnsLrho$ wlich hrve fii.d rcjelion .nd d.p.ndupon rhc BFo to iij..t th. Equir.d sisal at

raondry. thos *hich mry b. tui,bl. ov.. a

D.nicular i.g. !r audio fr.quaci6.Tho purpo* or th.e nor.s is to d.c.ib. r

as thc R.dio Range fil!.r, Two dirercni!.uio4 6f thn 6ha havr t*n avaihbl. as

Iixer. rh6c tvo very us.ful iems rE shovn

Th. Scdi@ applicorion or th6. filr.E vamainly Imn n ro Beem Approaqn syi.*(sBA) in vhich the marker sisak are a.nacllyBivcn by hodulat n noGqof about loco cltldvoie tmsmission suD.rinpo&d o. th. s'n.€iii.r ft.quoncy we .lso siv.n i.d rb. fih.Bhld rhrc swnch s.nin6 i Posnion I bein*ranG mark r sipnd. onlv: Pos. 2. voiesisnals only: Pos.3.6x.r out ofcircuit,

Fis. I shows .h. cun6 r.suxine arom rh.!s. of Dosnions I and 2 of rh. $,etorjm.rcs ro amar.uB sinc. fi provid6 . v.ryneF Ejdion on .irhs sid. ol ih. nomj.'lrEquancr. *hich b appoiinarcly r.021 c.p.s.

Th. uiir js qun. csily iniodu.cd i o rhcLy .irclir by plu$ins it i.to rh. phone soct.r

th* 6nm i! thar. being 30 lharp in rhc ;udioSlrtir.

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D r, and PertornM.e

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1i

Enge'lhrygiv.apsliarnisiiAton.Iolh.Eiod!dEloiBm.nolonv,

Firr.r d6to n ofb 6ken ro b. an.teniate4iEar job, but bareny i. ir Ehiirtvnnp|. !'iE .h. romur& harc dadv he;@h.d d d6ie, dr E 6'ty obh;.n b,A 3impr. siqtldion

.h@tr in Fi& r, rfi.ueoriroi.,r$6neri!'o b. '@hftnd.d sine n6rer hdow r Mc.ps. rro nor h.v. nuch in!.fcrin! efcd .idorins atr fie tow.r noE DrcduEs J ron.{nih B nor confonrbrc b rud oter toup.dodf, Th.d6jsdJa elhown bd :_Rr= Lord rclnhn( (phooe,

Fr : Cur otr raquemyF, - F@rcmy vhi.h mn,num

3!.nuariod i3 d6iEd.-L. L

wirh a v u.ofM-0.7

Derriu wnh rh.sinDten ryF !hom_ as inF s r,aoBedmirsr'. B ii F'c.4 Eob;in?d.ThBsl'0p.ol.urvc is cood ro. phone reprio.

6ur ir F$ibrc. neD sidc ro rh. rciei.b

firEr"n u$d. Thisismon $ned ro cw trrsirce n r.'luc .o maximum anln,Dri.o etrcquend odv a sho4 dknnc. 5*,v B€€r.nrriion or rhc vatue .r M siEsl niedvahe orFl ofaboui0.7. sin eo 7 r 0.7 =0 4e, r -o.4e : 0.5r, and r,o:ll: is aplron-m,icry0r. Thisneans rhar in od.r ro haye.6xed .ur{if lrequency or 30o qct.s, yhich kthar r.s6msnd.d lor cw sorrins. rh.rreq!.ncy ormdimum arennarion h* io h.

Usiis an tl-rype fih.r, n js po$ibL roobrain rrcdioi! of rhe.rd.r oa60 dB down

A suirabt. @lcut..ton lor such i ntrer h Biv.n lar.r.

For thc simplc. ryp. of frlr.r rh. rh)olcula(ioff rE l.l lo, Cw op..ato^ (6) for

Lk-:: :- r soo -o'3H eproi.cr- trF.R- ia'-sao:-lni6 onar

Thi giys an :nduc! c.vsl eor03H.nry.and i capeiiy vrlue

--:0'rrF.For phone tre, " cur oll.rieiucncy of I kcis \u.sescd as sunahJs. ro, :e onlb,e

iI

3.l4x3OOO:ortHaDDbx.

lrbnualioD n addirive, Ih. btrd.q lor the.ls b f.n bek froo ilo frcqenc, olmuimu Ejetion ir lini&d ed @r*qud!g

b'cLsrcud is o6himd.slsoaho-none dio inlroG 6di&Eblyqh.d uing th. .udio nlt 6. Ay th. pro!.rcnoie. or cI ud c2 in rb. Md.rived filbr,

dr or{rl bd huihm Erdio' f6qu.m; 'luir i.dilidut Br by

A sou@ of $!,!ly ror rh. E{uicd irdB-EnB is tbe bign fr.qmc, (*-aovrr DNeujr now oo rb. Ddker jth. 6ns. 30GI,000 c,p.s. ofi6 b@ ruiuu.@DDoMt. o.ry hi3h6r quilig odaliBsnodd be ured d ih. 6ridgjrg Mdds nrrho M-dsiv.n nlc. ,,'r b. ni*

In cl)lllftrcid DDie ioroid.I otu Er&dbul inqe aE v.ry diEo b bal thourwdalisd qdDnmi Cood Gu16 d to66incd wjth nomal inderano prcvididg,6y @dul 3hioldi.g: i3 anos€d, BDeiilly

1r. puDoe ollbe @r€ 6ay .pp@r DoElldEric.l than Irelicd but lhe prcor of th.Duddids b in ihe eatiq. Ira Ede. has Dordina.y L! chok of .6our th. valcn nliond atow, 3u&tiru.ion vill @i,yoabL th. o.ha vahe b b. round md lnfi.qucy or o1-of d.rmied.

Tb. vhoL Doinr is rhat .udio finar.nibl,tsigrak to b. @pien th6ush i.erro6@ *hich*n tho bsi .ryGl nlt r cm'o. @De virh,ud h thdcroE *€ll idx *hile ritiog tmeircublc virh a unit -hich dn t. iitoduen @th. oupu. ed of lno r@iv4, viihonl myjnE@l n diErlrion or rhe sr i6elt

Sltrlr.

mir dvc m indaue ErE ol o.zrH.nry dd a crprdy ralu .lrh.r .jd. or-:-- a!r6x 0 0r7 PP.mis $r. of 6ns n tmcd 'Conn.nt K"

din tuttnd th. M-d.riwd fler q 6hosn inFig, 3 @ b. wd ud valB fo' rhis .E rsaouoB: (For cw N a b.aoF)Ll- 0.7tk- MLr- 0-7 x 0,3:0-56H@ycI = 0.267Ck = 0.053 rFc2 - o.7cl:0.4FI. or0.2/F.&h !id.,

Tho *!uhd .w. k rhom ar a in Fi& 4,By uins tyo 5u.[ fi&G in si6 ihe .trdb€EDoe,'o.oDn..d.3jnelheruuxal

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AUDIO FREOUENCY OSCILLATOR

SPTOAT

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@Fud!4t, cr. @ n- - r ,!.. r, nc, 9t da.

xk 5qPl.4l", "?1t"1'-." e .44t"\!

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NADIO GEilTNE cME 3t, War, rorrntll

lhe noiion.tl HFS

T"._." vcrr.rll..rd eld.4 r.ns. r...ThL rs i! rtr,,,/Y hod.i,e F.

, in 6 band!. R!q'i!s .\M. }.ilt l cl,pqhtl. (tuirtr! opnrio: frcn a {n rnl ro\s n,prr,-. 6.,01r v$nror-

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CANADhN MARCOI{I COAIPANY

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