HP 424A Crystal Detectors Operating Note 00424-90023 July 1967

HP 00424-90026 Model 424A Crystal Detectors Operating Note Manual.

HP 00424-90026 1969 Model 424A Crystal Detectors Operating Note Manual.

HP 00422-90006 1969 Model 422A Crystal Detectors Operating Note Manual.

HP 00240-92003 1967 Model 240 Temperature Programmer Operating & Service Manual.

HP Model 6217A Bench Series DC Power Supply Operating & Service Manual 1967

HP 06516-90001 1967 Model 6516A DC Power Supply Operating & Service Manual.

HP 00422-90009 1979 Model 422A Crystal Detector Operating & Service Manual.