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US3777423A
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Condition responsive door holder-closer
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GB1319012A
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Door control unit
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Friction door holder
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Door holder
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Closure operator
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Closure operator
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Electromechanical door holder-closer
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Door control unit
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Separating link
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Hydraulic door checking mechanism
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Closure operator
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Electrically actuated door holder with manual opening and closing override, and automatic release to effect closure
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Protective barrier for products of combustion
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Dead stop device for doors
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Installation fixture for door control devices
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Hold-open apparatus for door
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Adjustable coupler for door closer
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Apparatus for overcoming the residual magnetism in an electromagnetic door holder
|
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Template,combinations therewith,and methods for use thereof
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US3571989A
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Plastic cement case
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