General Radio Type 874-UB Balun Operating Instructions Form 803-B 1956

General Radio Type 1501-A Light Meter Operating Instruction Manual 1954

Operating Instructions General Radio Company Type 1001-A Signal Generator

General Radio Type 544-B Megohm Bridge Operating Instructions 458-M 1962

General Radio Type 874-UBL Balun Instruction Manual 0874-0211-C 1967

General Radio Type 631-BL Strobotac Operating Instructions Form 394-W 1958

General Radio Type 631-BL Strobotac Operating Instructions Form 394-V 1957

General Radio Type 544-B Megohm Bridge Operating Instructions 458-L 1959