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2. Garage door - Wikipedia

   en.wikipedia.org/wiki/Garage_door

   The most common causes of injury from garage door systems include falling doors, pinch points, improperly adjusted opener force settings, and safety eyes, attempts at do-it-yourself repair without the proper knowledge or tools, and uncontrolled release of spring tension (on torsion spring systems). A garage door with a broken spring or the ...

3. Torsion spring - Wikipedia

   en.wikipedia.org/wiki/Torsion_spring

   Garage Door Sectional Torsion Spring A mousetrap powered by a helical torsion spring Video of a model torsion pendulum oscillating. A torsion spring is a spring that works by twisting its end along its axis; that is, a flexible elastic object that stores mechanical energy when it is twisted.

4. Garage door opener - Wikipedia

   en.wikipedia.org/wiki/Garage_door_opener

   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.

5. What the visa feud says about the coming Trump administration

   www.aol.com/visa-feud-says-coming-trump...

   Donald Trump’s siding with Elon Musk over visas for high-tech workers is the most significant example yet of the president-elect favoring powerful elements in his new MAGA coalition over his ...

6. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   Movement of the switch control lever applies tension to a spring until a tipping point is reached, and the contacts suddenly snap open or closed as the spring tension is released. As the power being switched increases, other methods are used to minimize or prevent arc formation. A plasma is hot and will rise due to convection air currents. The ...

7. Weatherstripping - Wikipedia

   en.wikipedia.org/wiki/Weatherstripping

   Every exterior door, or door to an uninsulated room such as an attic, must be weatherstripped as required by building codes in various jurisdictions. The materials used in door weatherstripping are thresholds, a piece of material (either a sweep or a J-hook) to match the door to the threshold, and the actual weatherstripping itself. Doors can ...