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  2. Floodgate - Wikipedia

    en.wikipedia.org/wiki/Floodgate

    Floodgates, also called stop gates, are adjustable gates used to control water flow in flood barriers, reservoir, river, stream, or levee systems. They may be designed to set spillway crest heights in dams , to adjust flow rates in sluices and canals , or they may be designed to stop water flow entirely as part of a levee or storm surge system.

  3. Automatic door - Wikipedia

    en.wikipedia.org/wiki/Automatic_door

    Heron used a similar application to open the gates to the city. [2] In 1931, engineers Horace H. Raymond and Sheldon S. Roby of the tool and hardware manufacturer Stanley Works designed the first model of an optical device triggering the opening of an automatic door. The invention was patented and installed in Wilcox's Pier Restaurant in West ...

  4. Swing-door operator - Wikipedia

    en.wikipedia.org/wiki/Swing-door_operator

    Some are built on top of a standard door closer. To open the door, the operator forces the closer in the opening direction. Then, the closer closes the door. The user may open the door manually, using just the door closer. In case of power failure while the door is open, the closer itself closes the door. Some are built without a door closer.

  5. Electric gate - Wikipedia

    en.wikipedia.org/wiki/Electric_gate

    An electric gate is a type of gate that can be opened and closed using an electrically powered mechanism. Electric Gate Options

  6. Gates Corporation - Wikipedia

    en.wikipedia.org/wiki/Gates_Corporation

    Gates Corporation sign at company headquarters in 1144 Fifteenth, Denver, Colorado Gates Industrial Corporation plc , based in Denver, Colorado , is a manufacturer of power transmission belts and fluid power products, which are used in diverse industrial and automotive applications. [ 1 ]

  7. Squelch - Wikipedia

    en.wikipedia.org/wiki/Squelch

    In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a strong input signal. [1] Essentially, squelch is a specialized type of noise gate designed to suppress weak signals.

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