From Tom Bearden – who wrote extensively about ‘over unity’ devices (alleged) and corporate suppression of ‘free energy’ concepts:
One of the real pioneers in early application of causal positron energy was inventor Edwin Gray of Van Nuys California. In WW II Gray learned of radar during his tour in the U.S. Navy, having previously attended advanced engineering school in the Army until discovered to be under age (15) and discharged.
After the war, by 1958 he had learned to perform what he called “splitting the positive”, using “cold electrical energy” as well as the normal positive electrical energy. His first motor was operating by 1961. Preparing to put units into production, in 1974 the Los Angeles District Attorney confiscated all Gray’s records and prototypes. To escape bogus charges, Gray later pleaded guilty to two minor infractions and was released. His prototypes were never returned. After several mishaps, moves, and more prototypes, Gray died in Nevada under mysterious circumstances in April 1989.