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5) wo. 1,520,089 

6) Ser.No.18,271 

7) Ser. N&.110,810 

OND89 fn• t1T• tigure nuaeral oode to understandable 

t• l•~tier azioupa. Applioabl• to inoandeacent lamp e.Jld writing olpheriAa aaohinea • 

Pro~eot• the pr1nc!!l• ot expressing only b7 letter• 

in ihe 91jiiir &U•- it• open tert oonsi st1ne; ot mall 

let \ei-a., ~ ~~e.qll.-. puno tua t ion marks and spa c i np;. This 

1• Tery important tor o1pher1ng 118oh1nea becauae, for 

reason• Of •eourity ot the cipher, it is not possible 

to aee tro• the cipher text what olaaa or signs the 

olear text oonajats ot, and also troa the standpoint 

ot •impl1o1ty ot manipulation aa numerals and signs on 

aooount ot being ciphered do not need to be chanped 

inio letters. Thia 1• alao cheaper for cipher telegrams, 

the clear text ot which oonsiata or several kinds or 

a1gna. It is ma·inly applicable to writing cipherinp 

machines. It is also very important for oipherinp machines ot other systems, and therefore extremely valuable to us. 

Prote•ts the ¥r1noiple of aubdividin~ the cinher text 

1nto groups o five or fifty or a hundred letters. It 

ie convenient tor counting th~ signs written down and 

ror finding out possible errors in mutilated messaFes. 

It 1a chiefly important for writing machines. 1t is 

absolutely necessary for ot)er types or cipherin~ 

machines and therefore especially valuabl~ to us. 

Electrical typewriter with type wheel. 

Ot course this type or construction is also anplicable 

to writing ciphering machines. '.le do not however use 

this as the writ inp: speed is too low. It is Lo·.,·ever 

valuable to us as a sooalled block1np, patent aruinst 

other inventions (Construction patent) 

Refers to: 1rrep.ular drive of the cipher cylinders. It 

is very valuable for all cipherinp machines on 11cc'..1unt 

ot the thereby increased security or the cinher (Principle and construction pQtent) 

Refers to~ chan~eability of thP cipher cylinders, which 

has important advantages from the technical cipher 

standpoint in that it permits the use of cylinders with 

other connections in any kind or erranpement tor cipher work. It is applicable to all cipher Machines, but is 

mainly used for security of the cipher in our 1ncandescer 

lamp machines (Principle and construction patent) 

@'pp roved for Release by NSA on 09-13-2013 pursuantto E .0. 1352a 
.. REF ID:A27365B -· ..... 

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8) Se:r. Nlt-.110,809 ' Fetera ·to}' Re"Yersing o;ylin~er. rt is consequently very iapo1·tant tor the simpler mnohines, tor exanrple, our 

iD04Dd$BCent l811p maohines, as this 9ffp,ets the savin~ 

ot an expensive 1:1nd space taking 26 p~rt. l~h'.illi'"-Over 

tor ciphering ana deciphering (Contruction patent). 

Moreo•er tive aore patents ba"Ye been appl1eJ tor in 1ermany, which μro- telt partly the principle and partly the constructional details or important 

parta ot the 1noandeaoent lamp and writing oipherin~ machines, F..Ivi irhioh will 

be a]ll.1ed tor in Am.erioa ._ within the 1ear or priority. These oonEiet or two 

appl1oe.\1ona tor our latest incandesoent laml) ciphering Dill.chines with C·:.) 11nt 1 nf 

Mohantam which not only considerably 1noreaae the aecur:: ty of the cir~; er 

in· tbeae maohinea but alao mtJ.ke the ha.ndl1nE of the machine very ei.mnle. 

·Th• tirst appl 1oat1on is .ror protection or a D:r1nc1p1e anti the second ror 

proteotion ot oonatruotional detail. Three further aopl:icationa refer to 

writing ciphering aaohtnee, one of them protectine the principle ot 

teohnioal searing arrangemf>nt11 and two 01' th.em protectinf?' coru:tructional 

1apro1'eaenta tor easter reading and quicker setting or the key and a c!1anF.e 

oTer arrangement •hioh oonaiderably cheapens the machine on ac~ount of its 

au1,able oonstruotion. The two last applioationa can al.Bo be used ~or 

1noan4esoent lamp maobinee. 

'lroa the patenta granied and those applied for it .an b~ necn that we ha~~ 1n A.aerioa the moat extensive patent protection of the principles or 

aeohanical ciphering •oh1 nes. Aa these patent applioat ions are at ill qui t.e 

recent, the patent a1tua'\1on in America is extremely 1~avorable for us for 

ll&D7 1eara to oo•e • 

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