A stitched-wiring process for miniaturized communications electronics

A recently developed manufacturing process known as stitched wiring permits economical fabrication of circuits by automatic or semiautomatic methods The technique is now being used in the manufacture of multichannel telephone and telegraph carrier equipment With the advent of transistors and similar solid-state components, an investigation was undertaken of the feasibility of using printed or etched circuit boards in telephone-type multichannel carrier equipment. The result of this study was the development of the manufacturing process here described. It permits automatic or semiautomatic fabrication, and maintains excellent standards of reliability in the finished product. It offers a degree of repairability comparable to more conventional wiring.