Telephone switchboard operator : instructors guide for all arms / prepared under the direction of the chief signal officer IT&T : electronics and telecommunication voor de veldtelefoon. (The Soundpowered-telephone) Field telephones and telegraphs for army use : including an elementary course in electricity and magnetism / by E.J. Stevens Signal training. Vol. III : Telephone sets F., marks I and I* electrical and mechanical engineering regulations Repeater, telephone, 2-circuit : General description Repeater, telephone, 2-circuit electrical and mechanical engineering regulations Repeater, telephone, 2-circuit : First Echelon Work Portable military L.B. set / [uitgave van] Bell telephone MFG. co. Antwerp use of field telephones in the field / A.G. Grinling speaking telephone, talking phonograph and other novelties / G.B. Prescott handleiding Digitaal snelheidsmeten met de standaard telephone Doppler radar / [samenst.: W.B.G.M. Oude Vrielink]
