Telegraph central office set TC-3 and switchboard BD-100 - USA Voorschrift, Technical Manual, 11-358 Locomotive, diesel-electric, 56 1/2'' gage, 80 ton, 0-4-4-0, 470-HP, general electric, cummins enige model NHBIS-600 - USA Voorschrift, Technical Manual, 55-1278 - USA Voorschrift, Technical … Switchboards BD-71, BD-72, BD-72-A and BD-72-B - USA Voorschrift, Technical Manual, 11-330 Switchboard BD-96 : repair instructions operational requirements - USA Voorschrift, Technical Manual, 11-4314 Operating practices for army administrative telephone switchboards - USA Voorschrift, Technical Manual, 24-210