Signal Corps Technical Infomation Letter

Evidently prior to Dec. 1, 1941 these were published quarterly, (No. 22 being published July 15- 1939) this is what that math would look like-

• 1, 2, 3, =1934
• 4 ,5 ,6, 7 =1935
• 8, 9, 10, 11, =1936
• 12, 13, 14, 15, =1937
• 16, 17, 18, 19, =1938
• 20, 21, 22, 23, =1939
• 24, 25, 26, 27, =1940
• 28, 29, 30, 31, =1941

Signal Corps Information Letter

Issue #22, July 1939

Issue #23, October 1939

Signal Corps Technical Information Letter

Issue #1, December 1941

Issue #2, January 1942

Issue #3, February 1942

Issue #4, March 1942

Issue #5, April 1942

Issue #6, May 1942

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