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  2. Garage door - Wikipedia

    en.wikipedia.org/wiki/Garage_door

    A garage door with a broken spring or the wrong strength can fall. Because the effective mass of the door increases as the garage door sections transfer from the horizontal to vertical door tracks, a falling garage door accelerates rapidly. A free-falling garage door can cause severe injury or death. The sections and rollers on garage doors ...

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  6. Glossary of mechanical engineering - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mechanical...

    The outer shell that houses the balls is called a nut rather than a bushing, but is not a nut in the traditional sense—it is not free to rotate about the shaft, but is free to travel up and down the shaft. Beale number – a parameter that characterizes the performance of Stirling engines. It is often used to estimate the power output of a ...

  7. Torsion bar suspension - Wikipedia

    en.wikipedia.org/wiki/Torsion_bar_suspension

    Torsion bar suspensions are used on combat vehicles and tanks like the T-72, Leopard 1, Leopard 2, M26 Pershing, M18 Hellcat, M48 Patton, M60 Patton and the M1 Abrams (many tanks from World War II used this suspension), and on modern trucks and SUVs from Ford, Chrysler, GM, Mitsubishi, Mazda, Nissan, Isuzu, LuAZ, and Toyota.

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