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A door may be held open with a device such as a door holder [1] or door closer, [2] which can automatically release the door upon the sound of a fire alarm and protect a building in the event of a fire. An ultraviolet door handle attendant can be installed to sterilize the existing handle. Automatic door handle sanitisers are used mainly in ...
The knobs are sometimes installed as an aftermarket accessory on farm and commercial tractors, their primary purpose being to ease one-handed steering. At the same time, the driver operates other controls with the other hand or is moving in reverse. Some boats are equipped with a helm featuring a stainless-steel wheel with a brodie knob. [4]
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