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  2. Paintball equipment - Wikipedia

    en.wikipedia.org/wiki/Paintball_equipment

    A paintball marker is the primary piece of equipment used in paintball to tag an opposing player. An expanding gas (usually carbon dioxide or high-pressure air) forces a paintball through the barrel at a muzzle velocity of approximately 90 m/s (300 ft/s).

  3. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    For example, aligning the rightmost 1 on the C scale with 2 on the LL2 scale, 3 on the C scale lines up with 8 on the LL3 scale. To extract a cube root using a slide rule with only C/D and A/B scales, align 1 on the B cursor with the base number on the A scale (taking care as always to distinguish between the lower and upper halves of the A scale).

  4. Engineering - Wikipedia

    en.wikipedia.org/wiki/Engineering

    Mechanical engineering is the design and manufacture of physical or mechanical systems, such as power and energy systems, aerospace/aircraft products, weapon systems, transportation products, engines, compressors, powertrains, kinematic chains, vacuum technology, vibration isolation equipment, manufacturing, robotics, turbines, audio equipments ...

  5. List of Chinese inventions - Wikipedia

    en.wikipedia.org/wiki/List_of_Chinese_inventions

    [250] [251] [252] The earliest hanging scrolls are related to and developed from silk banners in early Chinese history. [250] [251] [253] These banners were long and hung vertically on walls. [250] Such silk banners and hanging scroll paintings were found at Mawangdui, dating from the Han dynasty (206 BC – AD 220).

  6. Jefferson Davis - Wikipedia

    en.wikipedia.org/wiki/Jefferson_Davis

    Jefferson F. Davis (June 3, 1808 – December 6, 1889) was an American politician who served as the only president of the Confederate States from 1861 to 1865. He represented Mississippi in the United States Senate and the House of Representatives as a member of the Democratic Party before the American Civil War.

  7. Willis Tower - Wikipedia

    en.wikipedia.org/wiki/Willis_Tower

    Contractors excavated the lot to a depth of 50 feet (15 m), and they removed 180,000 cubic feet (5,100 m 3) of dirt from the site. [27] By that November, Spencer, White & Prentis Inc. was excavating a trench around the site, measuring 60 feet (18 m) deep and 20 by 216 feet (6.1 by 65.8 m) across.

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