voor de veldtelefoon. (The Soundpowered-telephone) Operating practices for army administrative telephone switchboards - USA Voorschrift, Technical Manual, 24-210 Telephone switchbord, type BD-14 Signal training. Vol. III : Telephone sets F., marks I and I* Veldtelefoon TELEPHONE SET "L" 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 Telephone central office set TC-10 - USA Voorschrift, Technical Manual, 11-338 Local-battery telephone equipment - USA Voorschrift, Technical Manual, 11-457 Telephone switchboard operator : instructors guide for all arms / prepared under the direction of the chief signal officer Telephone Terminal Set TC-21 (N) (Carrier) - USA Voorschrift, Technical Manual, 11-341
