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Modern manual door closer Eclipse door spring and separate checking mechanism. A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior.
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.
In 1954, Dee Horton and Lew Hewitt invented the first sliding automatic door. The automatic door used a mat actuator. In 1960, they co-founded Horton Automatics Inc and placed the first commercial automatic sliding door on the market. [5] With the invention of the Gunn diode, microwave motion detectors became common in automatic doors in the ...
The United States Capitol in the Southwest quadrant of Washington, D.C. in July 1939. L'Enfant Plaza was part of the Southwest Washington, D.C. urban renewal project, one of the earliest urban renewal projects in the U.S., and the first such in Washington, D.C. [5] The rapid expansion of the population of Washington, D.C., during World War II led to the extensive construction of suburban ...
The Washington metropolitan area, also referred to as the D.C. area, Greater Washington, the National Capital Region, or locally as the DMV (short for District of Columbia, Maryland, and Virginia), is the metropolitan area centered around Washington, D.C., the federal capital of the United States.
Virgin Australia crew members were allegedly sexually assaulted and robbed in one of Fiji's nightclub areas on New Year's Day, the island country's Deputy Prime Minister Viliame Gavoka announced.
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