US Patent 4,807,643
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
A portable device for simply and quickly measuring nerve conduction velocities in patients so as to assist the physician in diagnosing the onset of conditions that can cause permanent damage to the patient's nerves and muscles. The device is pocket-size, hand-held and battery-operated, and therefore it can be used by the physician on a day to day basis to provide a useful, objective parameter of the patient's clinical progress.
Rosier, Randy N. Digital electroneurometer. US Patent 4,807,643 filed August 16, 1982 and issued February 28, 1989. https://ir.uiowa.edu/patents/63