A removable door locks a removable modular unit into place within a computer case. The computer case includes a first opening and a second opening. The door fits into the first opening. The modular unit fits into the second opening to be positioned, when inserted, adjacent to the door. The door...http://www.google.com/patents/US5717571?utm_source=gb-gplus-sharePatent US5717571 - Mechanism locking removable module into computer
