Original Switchboard SB-22D/PT From US ARMY (Vietnam Era). The SB-22 manual switchboard is a portable local battery communications switchboard, readily adaptable for all weather field use or mobile and fixed base military shelter operations. The switchboard has facilities for interconnecting 12 separate voice frequency (VF) circuits. Additionally, the SB-22 has provisions to interconnect local battery telephone circuits, VF teletypewriter circuits and to control remote radio equipment. The item "SB-22D/PT US ARMY TELEPHONE SWITCHBOARD RADIO FIELD PHONE SIGNAL CORPS MILITARY" is in sale since Wednesday, October 19, 2016.This item is in the category "Collectibles\Militaria\Surplus\Radios". The seller is "east_sector" and is located in Opole. This item can be shipped worldwide.