SPSUl 072-Patents ARMY SERVICE FORCES 

OFFICE OF THE CHIEF SIGNAL OFFICER 

WASHINGTON 25, D. C. 

Mr. ·william F. Friedman 

Signal Security Di.vision 

Arlington, Virginia 

Dear Mr. Friedman: 

17 February 1944 

Inclosed herewith is your application for a patent, comprising a 

Petition, Specification, Oath, and License, in duplicate, and a photostatic 

copy of the draw~ng, entitled "Electrical Systemn. 

You should read over this application carefully and thoroughly. 

Minor corrections may be made in ink on the original. The inventor's initials 

and the date should be placed opposite each correction in ink in the margin. 

If you have suggestions or comments, it is desired that you return 

this application duly executed, together with a separate letter setting forth 

such comments and suggestions. 

Execution of the application consists in each inventor's signing his 

name (first name in f'ull) ~t the four places indicated by the attached red 

tabs on the (a) Petition, (b) Specification, {c) Oath, as explained below, and 

(d) License, if' any.· 

It the inventor is subject to military law, the Oath may be executed 

before a member of the Judge Advocate General's Department or other officer authori~ed to act as a notary public under Public Law SOO, Article of War 114. 

Ir the inventor is a civilian, except when in a theatre or military operation, 

he must execute the oath before· a notary public or other person mentioned in 

Revised Statute 4892, 35 u. s. Code 35. 

It is requested that the executed original application be returned 

to this office. The duplicate copy of the application and the drawing may be 

retained by you, personally, for your files. 

The papers so returne~ should not be marked "Restricted," "Confidential," or 0Secret, 11 {see A.G.O.-Memorandum W 380-11-43}, although they may be 

inclosed in a sealed envelope so marked on the outside. 

eclassified and a roved for release b NSA on 07-23-2014 ursuant to E .0. 1352 

ours very truly, 

~~/--===.__,~_:._ Donald K. Li;i.?lott---~ -v 

Lieutenant Colonel, Signal Corps 

2 Incls. Patents & Inventions Counsel, Legal Division 

Incl. 1-Patent Application 

Incl • .2-Photostat Drawing CONf IU£NT\Al 

24-70342-600 
-- -- --1;-

SPSLG 072-Patents ARMY SERVICE FORCES 

OFFICE OF THE CHIEF SIGNAL OFFICER 

WASHINGTON 25, D. C. 

Kr. un nm -F. itr-;.edman 

Signal Securi t;r td. 'Viaion 

Arlington, Virgin.ta 

Iiear Ur. Friedman: 

SPSLG-Ja 

Inclosed herewith is your application for a patent, comprising a 

Petition, Specification, Oath, and License, in duplicate, and a photostatic 

copy of the drawing, entitled "Electrical System". 

You shoald read over this application caref'ully and thoroughly. 

Minor corrections may be made in ink on the original. The inventor's initials 

and the date should be placed opposite each correction in ink in the margin. 

If you have suggestions or comments, it is desired that you return 

this application duly execut~d, together with a separate letter setting forth 

such comments and suggestions. 

Execution of the application- consists in each inventor's signing his 

name (first name in full) at the four places indicated by the attached red 

tabs on the (a) Petition, (b) Specification, {c) Oath, as explained below, and 

(d) License, if any. 

Ir the inventor is subject to military law, the Oath may be executed 

before a member or 'the Judge Advocate General's Department or other officer authori~ed to act as a notary public under Public Law 800, Article of War 114. 

If the inventQr is a civilian, except when in a theatre of military operation, 

he must execute the oath before a notary public or other person mentioned in 

Revised Statute 4892, 35 U. s. Code 35. 

. It is requested that the executed original application be returned 

to this oi'tice. The duplicate copy of the application and the drawi.ng may be 

retained by you, personally, for your files. 

The papers so returned should not be marked ttReatricted," nconfidentie.l," or "Secret," (see A.G.O. Memorandum \7 380-11-43), although they may be 

inolosed in a sealed envelope so marked on the outside. 

Yours very truly, 

,--0. ff,~ ~,,--

Dcnald lt• Lipp1:ncot.t Lieutenant. Co1onc1$ Si~ Corpe .., Pata:ita- le Inventions counsel, Lu;!al th1.s1on ,.. . Incle. · Incl. l·Patent Application 

Incl. 2-Photostat Dra?ting i ~ONf lOE:Nll\L 

24-70342-600 -