Revision as of 19:40, 13 June 2018 by BinD(talk | contribs)(Created page with "==References== * TM 11-4318 Switchboards SB-27/TTC-1 and SB-28/TTC-2 Repair Instructions Operational Requirements. War Dept. Jul. *1945. 48 p. U408.3.A13 TM 11-4318 Jul. 1945")