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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.
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Simple remote control systems use a fixed code word; the code word that opens the gate today will also open the gate tomorrow. An attacker with an appropriate receiver could discover the code word and use it to gain access sometime later. More sophisticated remote control systems use a rolling code (or hopping code) that changes for every use.
The alligator clip was first introduced to the founder of the Mueller Electric Company, [2] the primary producer of crocodile clips, by John H. Williams in 1906. It was introduced as a wire with a lightbulb in the middle, with a clip on either end of the wire. It was intended for use by electricians, and would allow them to easily tap into a ...
Copper wire in typical hairpin geometry. Hairpin technology is a winding technology for stators in electric motors and generators and is also used for traction applications in electric vehicles. In contrast to conventional winding technologies, the hairpin technology is based on solid, flat copper bars which are inserted into the stator stack ...
In May 1954, the Alliance Manufacturing Company first produced its own garage door opener and called it Genie. [2] In 1983 the company entered the home and shop vacuum market, and in 1985 it changed its name to Genie Home Products. [2] Overhead Door Corporation purchased the company in 1994. [2] The Genie Company is headquartered in Mt. Hope ...
However, on most railway vehicles using overhead wire, the trolley pole has given way to the bow collector or, later, the pantograph, a folding metal device that presses a wide contact pan against the overhead wire. While more complex than the trolley pole, the pantograph has the advantage of being almost free from dewiring, being more stable ...
Sectional garage door Up-and-over garage door Garage Door Hardware. A garage door is a large door to allow egress for a garage that opens either manually or by an electric motor (a garage door opener). Garage doors are frequently large enough to accommodate automobiles and other vehicles. The operating mechanism is usually spring-loaded or ...
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