67.91.1.214
E. F. Johnson Records
1933
Number of sheets: 10 E. F. Johnson Company Bulletins. Bulletin 100, December 1933, Type Q Antenna System; Bulletin 130, February 1935, Impedance-Matching Networks; Bulletin 200A, May 1935, Type D Transmitting Condensers; Bulletin 300, February 1935, Transmitting Inductors for Broadcast and Communications Applications; Bulletin 350, April 1935, Hi-Q Inductors for Amateur Transmitters; Bulletin I-352, May 1935, Inductor Assembly Instructions; Bulletin 100, October 1937, Type Q Antenna System; Bulletin 104, February 1937, Antenna Tower Lighting Systems; Bulletin 130, February 1937, Impedance-Matching Networks; Bulletin 963, August 1937, Types E and F Variable Condensers.