sentences:  The BC-348 is the 28 vdc powered version of the 14 vdc powered BC-224.The first version, the BC-224-A, was produced in 1936.Installed in almost all USAAF (and some USN, some British and some Canadian) multi-engined transports and bombers used during the fifteen-year period from before World War II through the Korean War, BC-348 radio receivers were easy to operate and reliable.