General Radio Type 1208-B Unit Oscillator Operating Instructions

General Radio Type 1215-B Unit Oscillator Operating Instructions

General Radio Type 715-A Direct-Current Amplifier Operating Instructions

General Radio Type 1209-C and -CL Unit Oscillators Operating Instructions

General Radio Type 1230-A DC Amplifier and Electrometer Operating Instructions

General Radio Type 1214-A, -D and -M Unit Oscillators Operating Instructions #CD

General Radio Type 605-B Standard-Signal Generator Operating Instructions

General Radio Type 1215-B Unit Oscillator Operating Instructions