00794cam a2200265 i 4500 128704 BJBSDDR 20250904105131.0 760128s1975 caua 000 0 eng 0914126091 0914126105 DLC DLC TK 6547 M478f 1975 621.3841 McMahon, Morgan E. 44748 A flick of the switch, 1930-1950 / by Morgan E. McMahon. Palos Verdes Peninsula, Calif. : Vintage Radio, 1975. 311 p. : ill. ; 22 cm. Vintage radio series Radio History. Radio Equipment and supplies Collectors and collecting. Radio broadcasting United States History. lcc BK lmm 104363 104363 0 0 lcc 0 0 CT BJB BJB HU 2023-04-11 0 TK 6547 M478f 1975 00000120729 2019-01-21 00:00:00 1 2019-01-21 bk