An electronic combination lock includes a combination lock having a dial with no markings thereon. Rotation of the dial drives a generator which produces electrical pulses. The voltage pulses serves as a power source for the electronics of the lock. The lock also includes a security feature to disable...http://www.google.fr/patents/US5517184?utm_source=gb-gplus-shareBrevet US5517184 - Electronic combination lock with high security features
Electronic combination lock with high security features
