An unattended apparatus for collecting aluminum cans and for compensating depositors of said aluminum cans based on the weight of the aluminum cans deposited, including a microprocessor-based control system which controls the energization of various system components, monitors system data, monitors alarm...http://www.google.de/patents/US4597487?utm_source=gb-gplus-sharePatent US4597487 - Method and apparatus for selective scrap metal collections
