HP 01922-90901 1971 Model 1922A Negative Output Operating & Service Manual.

HP Dual Differential Vertical Amplifier Operating & Service Manual 1971

HP 01920-90901 Pulse Output Model 1920A Operating & Service Manual.

HP 01915-90906 1971 Model 1915A Variable Transition Time Output Service Manual.

HP 01920-90901 1970 Model 1920A Pulse Output Operating & Service Manual.

HP 01908-90901 Model 1908A Delay Generator Operating & Service Manual.

HP 07035-90005 1971 Model 7035B X-Y Recorder Operating & Service Manual.

HP 69431-90001 1971 Model 69431A Digital Input Card Operating & Service Manual.