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4453390 |
Combination lock monitoring system
A combination lock monitoring system for recognizing and indicating electronically the condition of operation of the lock, the recognition being achieved by photo sensitive means responding to the...
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4375200 |
Antitheft device
An antitheft device adapted for attachment to the valve stem of an inflated vehicle tire may comprise: a plunger assembly including a plunger engageable with a valve core of the valve stem and...
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4059299 |
Auxiliary portable lock
An auxiliary portable lock which comprises a housing, a lock body receivable within said housing, and adapted for axial rotation therein, said housing being internally communicative with a tubular...
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3754224 |
SECURITY ALARM ACTUATING DEVICE
The invention is a security device for sensing the unauthorized opening of a gate or the like, the device including an electrical series loop incorporated into a mechanical structure mounted...
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3695212 |
BURGLAR ALARM FIXED TO DOOR OR THE LIKE
A burglar alarm is provided for use in connection with a door or other closure member for a building opening. A casing embedded in the door intermediate its inside and outside faces opens at that...
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3561395 |
BURGLAR ALARM FOR VENDING MACHINE
A burglar alarm for vending machines comprising a reinforced door assembly to protect the coin collection box, a key operated tumbler lock for securing the door assembly in flush position upon the...
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3086481 |
Restraining latch
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2789527 |
Emergency exit door lock
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