A telescopic and adjustable electrically conductive device includes a first electrically conductive piece and a second electrically conductive piece. The second electrically conductive piece is movable contacted with the first electrically conductive piece. The present invention further provides a socket...http://www.google.com/patents/US7488204?utm_source=gb-gplus-sharePatent US7488204 - Telescopic and adjustable electrically conductive device and socket device
