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  2. Ralph Teetor - Wikipedia

    en.wikipedia.org/wiki/Ralph_Teetor

    Ralph Teetor (August 17, 1890 – February 15, 1982) was a prolific inventor who invented cruise control.He was the longtime president of the automotive parts manufacturer The Perfect Circle Co. (acquired in 1963 by Dana Holding Corporation, then sold to Mahle GmbH in 2007) in Hagerstown, Indiana, a manufacturer of piston rings.

  3. Elliptical trainer - Wikipedia

    en.wikipedia.org/wiki/Elliptical_trainer

    Commercial elliptical trainer (rear drive version) Row of elliptical trainers at a gym ElliptiGO trainers are elliptical but not stationary. An elliptical trainer or cross-trainer is a stationary exercise machine used to stair climb, walk, or run without causing excessive pressure to the joints, hence decreasing the risk of impact injuries.

  4. Leaf spring - Wikipedia

    en.wikipedia.org/wiki/Leaf_spring

    Originally called a laminated or carriage spring, and sometimes referred to as a semi-elliptical spring, elliptical spring, or cart spring, it is one of the oldest forms of vehicle suspension. A leaf spring is one or more narrow, arc-shaped, thin plates that are attached to the axle and chassis in a way that allows the leaf spring to flex ...

  5. Life Fitness - Wikipedia

    en.wikipedia.org/wiki/Life_Fitness

    [5] [6] The sale was completed on July 11, 1997. [7] Later in 1997, Life Fitness bought Hammer Strength, a manufacturer of weight machines. [8] ParaBody, Inc. was bought by Life Fitness in 1998. [9] [10] In 2015, Brunswick Billiards was placed under Life Fitness by its parent company. In addition, Life Fitness created InMovement, a product line ...

  6. Epicyclic gearing - Wikipedia

    en.wikipedia.org/wiki/Epicyclic_gearing

    An epicyclic gear train (also known as a planetary gearset) is a gear reduction assembly consisting of two gears mounted so that the center of one gear (the "planet") revolves around the center of the other (the "sun"). A carrier connects the centers of the two gears and rotates, to carry the planet gear(s) around the sun gear.

  7. Teeterboard - Wikipedia

    en.wikipedia.org/wiki/Teeterboard

    Corteo performers practising on the teeterboard. The teeterboard or Korean plank is an acrobatic apparatus that resembles a playground seesaw.The strongest teeterboards are made of oak (usually 9 feet in length).

  8. Seesaw - Wikipedia

    en.wikipedia.org/wiki/Seesaw

    A "teeter-totter" may also refer to a two-person swing on a swing seat, on which two children sit facing each other and the teeter-totter swings back and forth in a pendulum motion. Both teeter-totter (from teeter , as in to teeter on the edge ) and seesaw (from the verb saw ) demonstrate the linguistic process called reduplication , where a ...

  9. Helicopter rotor - Wikipedia

    en.wikipedia.org/wiki/Helicopter_rotor

    An advantage of quad rotors on small aircraft such as drones is the opportunity for mechanical simplicity. A quadcopter using electric motors and fixed-pitch rotors has only four moving parts. Pitch, yaw and roll can be controlled by changing the relative lift of different rotor pairs without changing total lift. [32] The two families of ...