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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.
Raynor — the company's line of garage door openers for professional installers. This line of professional installers is slightly less common than LiftMaster. Craftsman — re-branded Chamberlain models sold at Sears. Those products have a "139" model prefix to denote that the Chamberlain Group made them for Sears.
The Model 45A utilized the magazine from the M1918 Browning Automatic Rifle. Rather than iron sights , it featured an integral scope. Its purpose is unclear, but it is alternately described as an "experimental .30 caliber light machine gun (LMG)" or a "field expedient .30 cal." [ citation needed ]
Electric eye for a garage door opener. An electric eye is a photodetector used for detecting obstruction of a light beam. An example is the door safety system used on garage door openers that use a light transmitter and receiver at the bottom of the door to prevent closing if there is any obstruction in the way that breaks the light beam.
The majority of the operators open the door directly or through an arm. Overhead concealed mount—the operator is mounted above the door and rotates the door directly, through its pivot. Surface mount, push (scissor arm)—the operator is mounted on the wall above the door, on the approach side and pushes the door with a linkage of 2 arms.
Model 45 may refer to: Model 45A, an experimental rifle developed by the U.S. Army in 1945. Beech Model 45, better known as the T-34 Mentor, an American basic training aircraft. Fairchild Model 45, an American utility aircraft of the 1930s. Firestone Model 45, better known as the XR-9, an American experimental helicopter of the late 1940s.
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