Doorkeeper can also be said of a person who is posted at the door to guard, but #doorkeeper in the hardware and manufacturing sense is the #mechanical or #automatic device that holds #doors closed and regulates passage through them—e.g., latches, locks, and hinges.
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Mechanical Testing Services | Mechanical Engineering Testing
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Sheet metal fabrication is a staple of product development and #mechanical engineering and is required in industry applications including #aerospace, #automotive, #electronics, and consumer goods.
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