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US7063042B2
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Continuous gear hinge with electrical conductor
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US4881346A
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Door and method of fabricating the same
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Latching mechanism for trolley-hung doors
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Spring hinge
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CA1053776A
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Hinge through which an electrical circuit is completed with means to interrupt the circuit
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US4068507A
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Limited access lock
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US4039433A
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Process and apparatus for recovering metal from soil
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Device for operating a pocket door
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Door closer having means to neutralize the door closing force exerted thereby
|
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US3948067A
|
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Locking system for two or more doors leading to an enclosed area
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Pivot arrangement for transferring pressurized air into a pivot door
|
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US3988859A
|
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Entry structure and air-operated lock therefor
|
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US3945670A
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Door exit fixture with pneumatic means for maintaining a latch bolt in its retracted position
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US3926460A
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Locking device for doors
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|
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Door closer with switch actuated thereby
|
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US3872541A
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Hinge capable of transmitting pressurized air
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US3896404A
|
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Magnetic switch hinge
|
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CA986159A
|
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Security system and lock therefor
|
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US3873141A
|
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Door securing apparatus having remotely controlled means to hold its latch bolt in a retracted position
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CA985860A
|
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Hinge with torsion bar
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