A pair of irreversible female and male connectors (2,1) fitting one in another have respectively female and male housings (22, 2), and the female housing (22) has a cavity (23) with a front opening so as to fit on the male housing (2) along an insertion direction. The female housing (22) has pin contacts...http://www.google.se/patents/US6945825?utm_source=gb-gplus-sharePatent US6945825 - Pair of irreversible complementary connectors
