Telegraph central office set TC-3 and switchboard BD-100 - USA Voorschrift, Technical Manual, 11-358 Principles of long distance telephone and telegraph transmission - USA Voorschrift, Technical Manual, 11-475 Radio sets SCR-399-A and SCR-499-A - USA Voorschrift, Technical Manual, 11-281 Test set TS-159/TPX - USA Voorschrift, Technical Manual, 11-1243 Test set I-157-A (tube and set tester, precision model 920P) - USA Voorschrift, Technical Manual, 11-1209 Test equipment RC-68 and RC-68-A - USA Voorschrift, Technical Manual, 11-1053 Trouble shooting and repair of radio equipment - USA Voorschrift, Technical Manual, 11-4000 Radio transmitter T-4/FRC, radio transmitterT-5/FRC, power rectifier PP-1/FRC, modulator MD-1/FRC, switch panel SA-2/FRC, oscillator O-2/FRC, amplifier AM-2/FRC - USA Voorschrift, Technical Manual, 11-820 chaplain - USA Voorschrift, Training Manual, 2270-5 Thermographs ML-77 and ML-277 - USA Voorschrift, Technical Manual, 11-426 Air corps : Lathes - USA Voorschrift, Technical Manual, 1-420 Signal : Commercial telephone, telegraph and electric time service, general - USA Voorschrift, Army Regulations, No. 105-30