A method and apparatus for identification and control of the handling of keys which will register when a key is removed from and returned to an identification and control device. The identification code of the user is fed into a control center (4) and the identification code is forwarded to a printed...http://www.google.co.uk/patents/US6900741?utm_source=gb-gplus-sharePatent US6900741 - Method and an apparatus for identification and control of handling of keys and the like
