1942 Bell Telephone Labs Portable Information Center Master Index ES-800515 WWII DTG protecting sensitive receiver circuitry during

protecting sensitive receiver circuitry during radio transmission

Signal Corps

showing authentic wear consistent with its age and military use

Air Force / Navy publication

1942 Bell Telephone Labs Portable Information Center Master Index ES-800515 WWII DTG protecting sensitive receiver circuitry duringOriginal Bell Telephone Laboratories, Inc. Portable Information Center Master Index, drawing publication number ES 800515, issued in MarchApril 1942. This seven page index identifies the technical folders and publications supplied with a portable communications information center. Listed subjects include telephone facilities, assembling and dismantling procedures, maintenance notes, terminal radio frame operation, PBX specifications, packing