Indian sappers laying telephone cables in trench Indian Sappers removing electric fittings from Turkish telephone lines - With the troops in Mesopotamia Veldtelefoon TELEPHONE SET "L" Reference data for radio engineers Reference data for radio engineers Operating practices for army administrative telephone switchboards - USA Voorschrift, Technical Manual, 24-210 Telephone switchboard operator : instructors guide for all arms / prepared under the direction of the chief signal officer Signal Training. Pamphlet no. 8. Signal Office Organization and Procedure. Part II. Procedure for Telephone Switchboard Operating. 1945 - Engeland Voorschrift Working Instructions. Telephone Sets F. High Power no. 1, Mk. II. WO 1024 - Engeland Voorschrift IT&T : electronics and telecommunication Telephone central office set TC-10 - USA Voorschrift, Technical Manual, 11-338 Local-battery telephone equipment - USA Voorschrift, Technical Manual, 11-457
