Public address equipment PA-4-C - USA Voorschrift, Technical Manual, 11-435 Local-battery telephone equipment - USA Voorschrift, Technical Manual, 11-457 Signal communication equipment directory : radio communication equipment - USA Voorschrift, Technical Manual, 11-227 Principles of aeronautical radio engineering / by P.C. Sandretto Van telegraaf tot satelliet : 125 jaar telecommunicatie in de Koninklijke Landmacht 1874-1999 / Sectie Militaire Geschiedenis, Martin Elands ... [et al. ; cartogr.: Louis … Complete 100-mile spiral-four carrier system - USA Voorschrift, Technical Manual, 11-2001 Radio engineering / by Frederick Emmons Terman Measurements in radio engineering / by Frederick Emmons Terman Communication engineering / by William Littell Everitt nieuwe handboek der radiotechniek / door A. Dominicus van den Berg Products in picture / Philips Telecommunication Industries/Philips Telecommunicatie Industrie Signal Corps : Fixed signal communication systems - USA Voorschrift, Army Regulations, No. 105-20