1
Brown Elvin E: Pin and socket contact electrical interconnect system. Collins Radio Company, May 16, 1972: US3663931 (70 worldwide citation)

A combined unitary pin and socket contact, receivable in a housing, designed for providing electrical interconnect between parallel stacked circuit boards, with guided entry of pins into contact sockets, and opposite side spring socket contact arms resiliently engaging opposite sides of an inserted ...


2
Brown Elvin E: Flush printed circuit apparatus. Rockwell International Corporation, Lutz Bruce C, March 25, 1975: US3873429 (7 worldwide citation)

A process for producing flush printed circuits with plated through holes comprising etching the circuit paths, flushing the circuit paths with the surface of the material, drilling the holes and producing plating material in the hole area through and subsequent to the use of electroless flash materi ...