Operating practices for army administrative telephone switchboards - USA Voorschrift, Technical Manual, 24-210 Working Instructions. Telephone Set, L. WO 1530 - Engeland Voorschrift Artillerist : tragbarere Feld-Fernsprech-Apparat [Fabrieksdocumentatie van} / Aktiengesellschaft Mix & Genest Telephon- und Telegraphen-Werke voor de veldtelefoon. (The Soundpowered-telephone) Telephone switchboard operator : instructors guide for all arms / prepared under the direction of the chief signal officer Hazeltine Electronics Corporation. Preliminary instruction book for navy model TCS-6 radio telephone and telegraph transmitting and recieving equipment IT & T International Telephone and Telegraph. Worldwide manufacturing and telecommunications Reference data for radio engineers Reference data for radio engineers 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 Legergroene vliegerkap met oormicrofoon, model H-87B, Verenigde Staten van Amerika