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  2. NTN Corporation - Wikipedia

    en.wikipedia.org/wiki/NTN_Corporation

    From 1984 to 1985, NTN Toyo concentrated on tapered roller bearings at its United States facilities such as their Elgin factory. This building was added onto in 1984 in order to produce such bearings at a higher rate of production. In 1985, NTN Toyo Nagano Works, a designer and manufacturer of precision miniature bearings, also opened for business.

  3. Hughes Tool Company - Wikipedia

    en.wikipedia.org/wiki/Hughes_Tool_Company

    The company was established in December 1908 [1] as Sharp-Hughes Tool Company when Howard R. Hughes Sr. patented a roller cutter bit that dramatically improved the rotary drilling process for oil drilling rigs. He partnered with longtime business associate Walter Benona Sharp to manufacture and market the bit.

  4. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    Typical ten-inch (25 cm) student slide rule (Pickett N902-T simplex trig) A slide rule is a hand -operated mechanical calculator consisting of slidable rulers for evaluating mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry.

  5. Roller screw - Wikipedia

    en.wikipedia.org/wiki/Roller_screw

    Roller screw. A roller screw, also known as a planetary roller screw or satellite roller screw, is a low- friction precision screw-type actuator, a mechanical device for converting rotational motion to linear motion, or vice versa. Planetary roller screws are used as the actuating mechanism in many electromechanical linear actuators.

  6. Artistic roller skating - Wikipedia

    en.wikipedia.org/wiki/Artistic_roller_skating

    Artistic roller skating is a competitive sport similar to figure skating but where competitors wear roller skates instead of ice skates. Within artistic roller skating, there are several disciplines: [ 1] Figures: the individual follows the figure circle line on a specific edge. Figures become progressively more complex with the addition of ...

  7. Precision and recall - Wikipedia

    en.wikipedia.org/wiki/Precision_and_recall

    In a classification task, the precision for a class is the number of true positives (i.e. the number of items correctly labelled as belonging to the positive class) divided by the total number of elements labelled as belonging to the positive class (i.e. the sum of true positives and false positives, which are items incorrectly labelled as belonging to the class).

  8. Roller chain - Wikipedia

    en.wikipedia.org/wiki/Roller_chain

    An example of two 'ghost' sprockets tensioning a triplex roller chain system. Roller chains are used in low- to mid-speed drives at around 600 to 800 feet per minute; however, at higher speeds, around 2,000 to 3,000 feet per minute, V-belts are normally used due to wear and noise issues. A bicycle chain is a form of roller chain.

  9. PromotionCode.org - Wikipedia

    en.wikipedia.org/wiki/PromotionCode.org

    PromotionCode.org is a free resource for online shoppers and maintains affiliate partnerships with major retailers such as Target, Wal-Mart, HP and Verizon. The site both originates and disseminates print coupons and online promotion codes. PromotionCode.org maintains a community of shoppers that exchange user-submitted codes and a codes-by ...

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