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The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.
Wall-mounted electromagnetic door holder securing a door in the open position. An electromagnetic door holder (electromagnetic door holder and release or hold-open device, sometimes informally called a mag hold open or electric doorstop) is a simple electromechanical mechanism which can be used to hold a fire door or security door open until given a signal to release.
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The Traffic Signs Manual [4] is a companion guide to the TSRGD which provides guidance to highway engineers about how and where to use traffic signs, including the size of sign to use (which depends on the speed of vehicles passing the sign).
A plastic cord lock (also known as cord fastener, plastic stopper, spring clasp or cord toggle) attaches to drawstrings and tightens without the use of knots. Cord locks allow mountaineers to fasten clothing and camping equipment quickly in cold conditions when the fingers are encased in heavy gloves.
Level crossing signals are electronic warning devices for road vehicles at railroad level crossings.. Level crossings can be operated in various ways. In some countries such as the UK, the warning devices are more often than not activated by remote control, I.e. an operator pressing buttons.
On November 8, 1911, the Chevrolet Motor Car Company was incorporated. [6] It was founded by Swiss race car driver and automotive engineer Louis Chevrolet with his brother Arthur Chevrolet, William C. Durant and investment partners William Little (maker of the Little automobile), former Buick owner James H. Whiting, [7] Edwin R. Campbell (son-in-law of Durant) and in 1912 R. S. McLaughlin CEO ...