An ultra-high density electrical interconnect system is described wherein the pins and sockets are generally triangular in cross-section. This configuration allows for a density of 400 or more contacts per square inch wherein the contacts are supported on a grid pattern having 50 mil or less spacing...http://www.google.se/patents/US4932902?utm_source=gb-gplus-sharePatent US4932902 - Ultra-high density electrical interconnect system
