The present invention automatically limits the number of decks drawable from a large number of decks within one locker. For this purpose, the decks are classified into sets each comprising two decks adjacent to each other. A deck lock mechanism according to this invention is composed of a first locking...http://www.google.de/patents/US6061321?utm_source=gb-gplus-sharePatent US6061321 - Deck lock mechanism and library apparatus
