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

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

PRD Type 812 Universal Klystron Power Supply Operating Instructions 1961

General Radio Type 1134-A Digital-to-Analog Converter Operating Instruction 1961

Polytechnic Research PRD Type 809 Klystron Power Supply Operating Instruction

Kintel COHU Model 114T Test Bridge Operating Maintenance Instruction 2X-70 1961

ATOHM Electronics Model 212 Continuity Percentage Bridge Operating Instruction

PRD Electronics Type 965 Electronic Counter Operating Instructions 1964