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GB0804428D0
|
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Elevator position sensing method and apparatus
|
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Alarm apparatus condition reporting
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Doorway monitoring systems
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Detector
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Doorway obstacle detector using light pipe
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Obstacle-detecting apparatus for a powered door system
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Safety sensing system for a powered door system
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Edge device for a powered door with infra-red and visible elements
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Door or access control system
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Apparatus for reducing power consumption in a lift door protection system
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Door obstruction detector
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Lift safety system
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GB9415772D0
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Lift installation
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Lift installation
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Alarm or control system
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US3613062A
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Flame quality and presence monitor for multiburner furnaces
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GB1205636A
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Doppler apparatus
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CA891141A
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Doppler apparatus
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