Radio Frequency RFL Model 541A Crystal Impedance Meter Handbook Instruction 1954

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

Radio Frequency RFL Model 541A Crystal Impedance Meter Handbook Instruction 1959

Wayne Kerr B601 Radio Frequency Bridge and Z601 Low Impedance Adaptor manual

RFL Handbook of Instructions Model 531 Crystal Impedance Meter signal corps

Measurements Model 59-UHF Megacycle Meter Operating Instructions 1954

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

Radio Frequency RFL Model 1221 Magnet Charger Instructions Manual 1957