Hewlett Packard/ Sanborn Division. Operating and Service Manual. D C General Purpose Amplifier 126, 126B, 64-300A, 64-300B, 67-300, 67-300B.. USA: Hewlett Packard/ Sanborn Division., 1968.

Hewlett Packard/ Sanborn Division. Operating and Service Manual. 60-1300, 60-1300B Sanborn Twin-Viso Recorder.. Waltham, MA: Hewlett Packard/ Sanborn Division., 1957.

Hewlett Packard/ Sanborn Division. Instruction Manual for Sanborn ECG Preamplifier (Model 60-200).. Hewlett Packard/ Sanborn Division., undated.

Hewlett Packard/ Sanborn Division. Instruction Manual for Sanborn ECG Preamplifier (Model 60-200).. Hewlett Packard/ Sanborn Division., undated.