US Patent Number
A probe with a puncturing, electrically conducting needle is constructed to enable the user, whether right or left handed, to position the needle rapidly and accurately at a selected coordinate of a sensor package.
The Board of Trustees of the University by the Kentucky, Lexington, Ky.
Hurst, George S., "Hand Held Probe for Use in Electrical Sensing of Plane Coordinates" (1974). Physics and Astronomy Faculty Patents. 7.