U.S. Army Signal Corps Manual Set – TM 11-2114 & TM 11-2115 (1949–1950) ensuring realistic training for mortar

ensuring realistic training for mortar crews

working hammer and trigger

featuring a single-stage rocket motor that replaced the earlier gas generator expulsion charge

but remains intact and legible

U.S. Army Signal Corps Manual Set – TM 11-2114 & TM 11-2115 (1949–1950) ensuring realistic training for mortarStepping Switch Test Set + Crash & Conference Equipment Central Office Systems Offered here is a matched pair of original U. S. Army Technical Manuals covering early military telephone switching systems. These manuals document the operation, testing, and control of step by step (Strowger type) central office equipment, which formed the backbone of WWII and early Cold War communications networks. This is a complete, complementary set, with one manual