REF iD:A2436312 l&TANDARD FORM NO. 6" '· ,' 

Office Memorandum · UNITED sTATEs GOVERNMENT I 

TO Mr. W. F • :rriedllan, il'SA.•14, Rooa 19232!, l'CS DATE: 25 April 1950 

FROM Mr. Henry B. Stauffer, il'SA·OJA.5, Rooa )109, NCS 

SUBJECT: Hebern Prel:1•1nary Report 

1. Cancel pegei!! 4, 8, and 12 and substitute tb.erefer.r.oi.sures 1, 

2, alld 3 hereof. 

2. Cancel pages 14, 15, and 16 and subeti tute th&Nfor InclesUN 4 

hereor. 

3. - Incloaure 5 a po.rt of .. E:sbibit ll. /JttVl/vv. 

5 !JM:ll j1!/B.\ B. 

1. New pg 4 Chief, SA-0.3!5 

2. New pg 8 

J. New pg 12 

4. New pg 14 ~. Add to Exh B eclassified and approved for release by NSA on 

9-13-2013 ursuantto E.O. 13526 
REF ID:A2436312 

...Utde \he &tbern Ct7P~liliibic a.a.e. All ot '1Ml ol11ea .U 

tor• planllty ot ratchet wbula ar.t. code wheel•• each of -U. 

atobtt wheels havlnf a peripheral flue• \hereon., ~ t1uap (or 

a ma J:IOtch 'Uwreiu, Clda 19j aer'1!lg to control t.M .-Mpp1D£ flt 

- ou.r ra\chclt llheol an4 one or \he code whMl1 ot iihe 111'1Pt.o-

~ ...... ~ olaia, 1t Wringed ,+.all, an !ntr1Dge4 

~ "3' the SmroY wh!eh• ..im:.e .-ong ti.uited stat.ca ArlV' devloea, 

~ oaa profUe:i Oil 1\3 rotors (:Jimilar to liebern'a fl·npe) 

to nn!ar tDOpe.rati"- ~ operative .au :tor produo1.Dc rotor man-

.mi. n - be tdzl.1 argued, howeve4"• that ar. in~wu l"Okr 

us11 rbJ,- 41011Pl'1aing clrcu1t ~tions1 stepp!Dg Waok• wt 

pwl~ral 011.1A pro.t11e (as uaed J.n ~ SIGFO"i 1- ao'\ "19 aubsian• 

Ua1 equiftlant of !ebern'• code .. 1, ratchet wheel wl\b 1'8 pert• 

~ t'laDa•, am ecamoctlng 1 s~. The pvint ~ be ot i.e 

~ hOeP' .r01: \tw tut. t.bat, 1t t.be Cover~at uni~ ~ 

'1ll'V 'H ocmaidered tfl9 IJUbst.anthl equivalent or ta. urNJ&eun\ ot 

...._ ola1ma fS'Ca \be •tandpoint. of intrbie!"Jellt, t.tlen it 1a ,..albJ. 

U.\ ....,- alat•a ot a lawr !Iebern p&tent berEa inYolved (J..861.85'7) 

.,. .a tor double pat.Ml.ti.ti&. n. presmpU.on or •lldity as...-

lll'!a Uie ear],y ease tJw.s aight llllg&tivo intrlnger.iitnt or these olatms. 

A ~ CQIUIJ.deraUon •lone these llnee 1s that the urr.nge6\141nt. ot 

.. ltiiln prov1dq a flmction iapoesible in the intlliral.SIGFOI nrtxctare, ...,]¥• relative a4Juataent, or oocle wheel am ntabet 1ibMl. 

m et the elaims ot t.b1e group, rurthermore, uen be nad .. nqu1ring 

• tbgle oumdl\8 not.eh (this is spoc1t1o 1D Cld.a 19) CMS• W.. 

~llL..)''\~l\·7 r.or·· f )h¢'. Q.1 lill iS 
REF ID:A2436312 

m,'65, ~ ( J'Nleh), su.062, .m cltt.iau 51 am. 52 ey the lutNGUcMd i-\dta to A. B. ~ph. Additionally, it. 1B ~ 

tta\ N.Cbinea unutnot.urtd t1 Chltfrl~inon Akt • ..r.AS., ~Un,. 

ud w14 ~ tb8 ~ ITRnigra." (which uould ~tiC1t'flt:& tbe.119 

ttla1•), ,.... mowa. ho:tt:rre ttwi tlit-bem Um;n.Um1 bet the -.ruen 

da~ tbtt can !Otar oo t1-d 1a a dsoo.atr.dJ.on in S..lt.H1"1-l in 

llooMber, 192). 

S. it. ~Ub. ~t t<.l Hebe:m p&tct lt861,857, Claiils l ~ 

8 apoc1ty !l'IMm t'cl" •lcottwl:r ~ting oot.ion Q£ one or 1krO rot.on 

in a ~ ?lllM os- tor 901.eoUwl.3' 'f'U7ill€ tho rtlAilw ~ 

tbt:Nat'. S1w M adl1tar;r ~rba taw 1t.,leet1w l!l8an4 tor ~ 

...ung flOl'mll.1 WOIW!Ctt19 of tbo rot.on (Claia l through J) ,. trlMfl.NUft wna- .n:. ~ (\beir) iielatiw ~· b'cc l8rO to •xi- __.. (Clala ')• theee eld• ae ccuidered not 1nf'l'111814. ClA1l8 4 

.s 6 Ul:N'Ch a, 'fllMoh ..,._, .t.e:U.w 111H1W rer ~ the ni.u• 

"'od• ot _, -... or llWO nW., wttll no ~ot.tone on b 90Ufl1i er 

ta"PtJ ol "ftd1.A~ _,. be ~ to' tba SIGB!U. 'f', "'1t. U6 'Ulough'\ to 

i. .uc:t~ tf' .._ i.m~~ mi pouib1J iv 1. 1. trJ~ 

(&rtu.h). 1'1!,763,, &litJ (~ni., S4.Et.m1 or illtaraat a.l.au a ttahaoe'• 

t.,4'12,775J 

1>. <Jla1• ' tmu:¥la u .. tr.ta1. _., o:atrolUlr ....... 

n.1. (lVb:llt) ••wt, aoch -.ne ~ tmrJ prot1lu ,.._pt;ed to ,.... 

wlft ritb (a) eodo 1Sbffl• (ClllM 9 Atrl l,3), ~ formed en b rcten 

~oelfu {CW. J)-U),. ~ t)'Pfr ot aur111" lllJIOU'ied 1- tmeh.il'MG 
)-•. (/ J 

REF ID:A2436312 

7. 31noe Ant" 81Uari1lr ~ ~ ru.. .,.. ~ • 

.s ta. s.tpaJ CWpe tu ~ ..,- o1 iu mu • St. lout#. 

MMaart, tr.co~ m ~~baa..._ MISe ot ~ 

81ilUna to 1bt-~ and procareamit ot a.t'ttl'mtlfJtt .,,.._ 

an1:tt!e GftUl~. ttoet or t.b9ee ~aet. ooaWned .,,.....,w ~leae illdee.ttr eleW!u, but the olfte.ea reliM9d th& oanwacton ~t liabllttJ' ~ thair 'IOlit se hued an deftnit. 

~t :s~1.t1w:ticm1 am tl\13-. ~ u..i cpe. 'ftlrlto ol4 

~ ue ~ w h!lW oonu.t.nl'4 ~ eJ..aw, ~ 

~ 11ab111v. ~ t>t .. " ha'IB been~~ bl:rlle 

aot 1" been rece1'Nd. 

I. A lS.n flt tho wt ~ paitlllb MMiUNd U 

~ dth th.- Heblm o.1aUr 1a 8Ff•lldt Elhibit ». 
REF ID:A2436312 .. ,... -~,~ ~' 

_•\....l\i,-\· .... ; 5.. 

-------------------!> lill • - idJa ~ • ...-...--....... •-...fl, .. 4l""'I...... 19 i: