|
US5303965A
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Vandalism-proof lever handle system for locking or latching device
|
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US5079936A
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High security cylinder lock
|
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GB9006488D0
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Cylinder locks
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US4797779A
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Pulsed power supply
|
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US4704767A
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Security door hinge system with locking elements
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Security lock
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US4140357A
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Electric hinge
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Lock knob control mechanism
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Prison door locking mechanism
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Electric lock
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Institutional security system
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Jail locking devices and the like
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CA766020A
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Motor-driven or operated locks, and the like
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CA746232A
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Lock controls
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