Bird Quality Instruments for RF Power Measurement Product Catalog GC-68 1967

Beckman Technical Training Program by Beckman Instruments Inc.

Wavetek Electronic Test + Calibration Instrumentation Catalog

Berkeley Division Beckman Instruments Employee Instruction Manual July 1955 Vt

Bird Electric Corporation 1967 Catalog GC-68B.

Boonton Electronic Test Instrumentation Catalog.

Wavetek Electronic Test & Calibration Instrumentation Catalog.

Texas Instruments Semiconductors and Components Catalog 1967-1968