Hewlett Packard- Sanborn Division. Operating and Service Manual (140, 140B, 64-500A, 64-500B, 67-500, 67-500B Strain Gage Amplifier). Notebook holds the following contents per section: Description, Operation w/ Strain Gage Half-Bridge, Operation w/ Strain Gage Full-Bridge, Operation w/ Resistance Bridge Transducer, Operation w/ Ractance Bridge Transducer (static calibration), Operation w/ Differential Transformer (static calibration), Operation w/ Resistance Thermometer (Special element), Operation w/ Resistance Thermometer, Special Operation, Operators Maintenance, and Theory.