General Radio GR Type 716-C Capacitance Bridge Operating Instructions 1954

General Radio Type 874-UB Balun Operating Instructions Form 803-B 1954

General Radio Type 783-A Output-Power Meter Operating Instruction 1957

General Radio Type 1934 Walsh-Healey Noise Exposure Meter Instruction Manual

HP 612A UHF Signal Generator Instruction & Operating Manual 1954

General Radio Type 1142-A Frequency Meter & Discriminator Instruction 1961

GENERAL RADIO CO. TYPE 1215-B UNIT OSCILLATOR OPERATING INSTRUCTIONS MANUAL

General Radio Type 1570-AS15 Automatic Voltage Regulator Operating Instructions