A device for measuring the relative angular position of two bodies with respect to a point is provided with a first measuring element and a second measuring element, relatively movable with respect to one another and connectable to a first body and a second body, respectively; the first measuring element...http://www.google.com/patents/US20040267379?utm_source=gb-gplus-sharePatent US20040267379 - Device for measuring the relative angular position of two bodies with respect to a point, and articular prosthesis provided therewith
