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| US4289001 | 15 janv. 1980 | 15 sept. 1981 | Unimax Switch Limited | Key-operated device for access control system | | US4407147 | 22 déc. 1980 | 4 oct. 1983 | Supra Products, Inc. | Peripheral key tumbler lock | | US4578969 | 26 nov. 1984 | 1 avr. 1986 | Supra Products, Inc. | Tumbler lock having peripheral key | | US6199414 | 19 janv. 2000 | 13 mars 2001 | | Quick release locking means for a cover |
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