1
Hurst George S: Electrographic sensor for determining planar coordinates. Elographics Incorporated, Skinner Martin J, March 19, 1974: US3798370 (217 worldwide citation)

An electrographic sensor for determining planar coordinates with good resolution, e.g., about 0.1 mm, and an overall accuracy of about 0.4 mm. A rectangular single sheet of extremely uniform resistive material has a row of small electrodes arranged along each edge with discrete resistors connected b ...


2
John E Talmage, L Dexter Bates: Lucent electrographic sensor for determining planar coordinates. Elographics Incorporated, Martin J Skinner, January 31, 1978: US04071689 (70 worldwide citation)

An electrographic sensor for determining planar coordinates is described whereby graphical material to be analyzed may be placed beneath, or projected against, the rear surface of the sensor. This sensor is of particular value for placing on the face of a cathode ray tube. The sensor includes a rigi ...