Ian Wilson wrote: > This is a control unit for something, can't find it. > Thanks for any IDs. Commander's control box for vehicle intercom set RC-99: RC-99 Vehicular Intercom BC-367 AF Amp & DM 25* for 12 V, or BC-667 & DM-45A 24 V. BC-606 Driver's Control Box BC-739 Commander's Control Box T-30 mikes and HS-30/U headsets Manual TM 11-702, 1943