Principles of long distance telephone and telegraph transmission - USA Voorschrift, Technical Manual, 11-475 Telephone repeater EE-89-A - USA Voorschrift, Technical Manual, 11-2006 manual Electrical instruments and telephones of the U.S. signal corps : revised 1910 Telephon- und Signalvorschrift für die k.u.k. Infanterie und die Jägertruppe Handbuch für den Telephon- und Signaldienst / J. Czermak training manual / united states army Telephone switchboard operator : students manual for all arms Telephone central office set TC-10 - USA Voorschrift, Technical Manual, 11-338 Local-battery telephone equipment - USA Voorschrift, Technical Manual, 11-457 IT&T : electronics and telecommunication Apparatus carrier telephone 1 + 1W Mark 1* and 1 + 1 C : issue nr. 1 use of field telephones in the field / A.G. Grinling speaking telephone, talking phonograph and other novelties / G.B. Prescott
