[1]Der Pendel-Telegraph von Siemens & Halske, by E. Ehrhardt, 6 Jan. 1917.
[2]Telegraphy, A Detailed Exposition of the Telegraph System of the British Post Office, by T. E. Herbert, Fourth Edition (with Addendum), Sir Isaac Pitman & Sons, Ltd., London, 1920.
[3]“Teletype’s Salty Past,” The AP World, Autumn 1962, p. 29.
[4]AP, The Story of News, by Oliver Gramling, illustrated by Henry C. Barrow, Farrar and Rinehart, Inc., New York-Toronto, 1940.
[5]“Some Recollections of AP’s First Field Maintenance Man,” The AP World, Autumn 1962, p. 28.
[6]“Some Recollections of AP’s First Field Maintenance Man,” The AP World, Autumn 1962, p. 28.
[8]The Romance of Time, by Brooks Palmer for The Clock Manufacturers Association of America, Inc., New Haven, Conn., 1954 (copies may be purchased from American Clock & Watch Museum, Inc., 100 Maple Street, Bristol, Conn.).
[9]“$30,000,000 Worth of Teletype,” Fortune, March 1932.
[10]“$30,000,000 Worth of Teletype,” Fortune, March 1932.
[11]“Walter J. Zenner Retires,” Teletype News, February 1964.
[12]Telegraphy, by J. W. Freebody, Sir Isaac Pitman and Sons, Ltd., London, 1958.
[13]From brochure published by American Telephone and Telegraph Company, 1-9-28.
[14]“Communications from Morse to Satellites,” by George A. Shaw, RCA Communications, Inc., Wire and Radio Communications, Sept. 1962.
[15]“Telex in the U.S.A.,” Communications & Electronics, Sept. 1962.
[16]National Military Establishment, Dept. of the Army, Wash. 25, D.C., for release Sunday, Feb. 13, 1949.
