Electronic combination lock with high security features - HARVEY MICHAEL P; MILLER J. C (2005)
Keywords: ACCESSORIES THEREFOR; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDEDFOR ELSEWHERE; CHECKING-DEVICES; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; FIXED CONSTRUCTIONS; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATING RANDOM NUMBERS; HANDCUFFS; KEYS; LOCKS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PHYSICS; REGISTERING OR INDICATING THE WORKING OF MACHINES; REGULATING; SAFES; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TIME OR ATTENDANCE REGISTERS; VOTING OR LOTTERY APPARATUS; WINDOW OR DOOR FITTINGS