PRD Electronics Type X712-A Signal Sources Operating Instructions 1964

PRD Electronics Type L712 & S712 Signal Sources Operating Instructions 1962

Polytechnic Research PRD Type 219 Standing Wave Indicator Operating Instructions

PRD Electronics Type 6690-A Peak Power Meter Operating Instructions 1972

CHOICE: Hewlett Packard HP Operating & Service Manuals Electronics

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

PRD Electronics Type 670 Series Calorimeters Operating Instructions 1962

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