PRD Types 219, 219-H, 219-L Standing Wave Detectors Operating Instructions 1960

Polytechnic Research PRD Type 277A Standing Wave Amplifier Operating Instruction

Polytechnic Research PRD Type 277 Standing Wave Amplifier HandBook & Operation

Polytechnic Research PRD Type 809 Klystron Power Supply Operating Instruction

Polytechnic Research PRD Type 650-B Universal Power Bridge Instructions 1956

PRD Electronics Type 965 Electronic Counter Operating Instructions 1964

PRD Electronics Type L712 & S712 Signal Sources Operating Instructions 1962

PRD Electronics Types 650-C Microwave Power Meter Operating Instructions 1961