scope:

This publication contains information on electronic communication equipment that is used or is available for use by the Army, the Navy, and the Air Force. It covers radio, switchboards and witching, repeaters and repeating, carrier, teletypewriter, intercommunication and public address, facsimile, light signalling, television, and miscellaneous equipment used for communication and in related systems at all command levels. Equipment covered are end-items, and those component parts thereof, which can be, and are authorized for use as operating end-items, or which are issued as major operating component parts of two or more end-items.