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  2. Mattracks Inc. - Wikipedia

    en.wikipedia.org/wiki/Mattracks_Inc.

    Mattracks was started by Glen Brazier. The company developed out of a drawing by his 11-year-old son, Matt, in which tracks took the place of a truck's tires. [3] The tracks first went on sale in 1994. [4] The rubber track conversion system was first manufactured in Thief River Falls, Minnesota in 1992. [5]

  3. Window blind - Wikipedia

    en.wikipedia.org/wiki/Window_blind

    Various window blind styles. A window blind is a type of window covering. [1] There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard material, including wood, plastic or metal which are held together by cords that run through the blind slats.

  4. Continuous track - Wikipedia

    en.wikipedia.org/wiki/Continuous_track

    A non-powered wheel, an idler, is placed at the opposite end of the track, primarily to tension the track, since loose track could be easily thrown (slipped) off the wheels. To prevent throwing, the inner surface of the track links usually have vertical guide horns engaging grooves, or gaps between the doubled road and idler/sprocket wheels.

  5. Altazimuth mount - Wikipedia

    en.wikipedia.org/wiki/Altazimuth_mount

    When tracking at elevations close to 90°, the azimuth axis must rotate very quickly; if the altitude is exactly 90°, the speed is infinite. Thus, altazimuth telescopes, although they can point in any direction, cannot track smoothly within a "zenith blind spot", commonly 0.5 [3] or 0.75 degrees [4] from the zenith. (i.e. at elevations greater ...

  6. List of roller coaster elements - Wikipedia

    en.wikipedia.org/wiki/List_of_roller_coaster...

    The vertical loop on Full Throttle is one of the world's tallest and largest at 160 feet (49 m) A vertical loop is one of the earliest and most common roller coaster inversions in existence. It is a continuous, upward-sloping section of track that eventually completes a 360-degree turn, inverting riders halfway into the element.

  7. Human-powered transport - Wikipedia

    en.wikipedia.org/wiki/Human-powered_transport

    Human-powered transport is the transport of person(s) and/or goods using human muscle power.Unlike animal-powered transport, human-powered transport has existed since time immemorial in the form of walking, running and swimming, as well as small vehicles such as litters, rickshaws, wheelchairs and wheelbarrows.

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