... for a while after their invention), point-to-point construction was used. For prototypes, or small production runs, wire wrap ... efficient. Predating the printed circuit invention, and similar in spirit, was John Sargrove's 1936–1947 Electronic Circuit Making Equipment (ECME ... on the process, which was classified by the U.S. Army, was assigned to Globe Union. It was not until 1984 that the Institute ...