Basic interchangeable building blocks such as to create a structure and/or an exoskeleton for an apparatus for monitoring and controlling the movements of body members comprising a single axis joint adaptable axis joint, an axial rotation joint, a wrist rotation joint and a linear motion transmission...http://www.google.de/patents/US5656904?utm_source=gb-gplus-sharePatent US5656904 - Movement monitoring and control apparatus for body members
