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  2. Ironworker - Wikipedia

    en.wikipedia.org/wiki/Ironworker

    The average pay for a reinforcing bar ironworker in residential construction was an hourly wage of $23.59 in early 2009, and rebar ironworkers in commercial and industrial construction earned an hourly wage of $39.11. [12] The typical tools of a reinforcing bar ironworker are pliers, tie wire reels, rodbuster bags, and rebar hooks.

  3. Vacuum - Wikipedia

    en.wikipedia.org/wiki/Vacuum

    Structure of the magnetosphere - is not a perfect vacuum, but a tenuous plasma awash with charged particles, free elements such as hydrogen, helium and oxygen, electromagnetic fields. Outer space has very low density and pressure, and is the closest physical approximation of a perfect vacuum. But no vacuum is truly perfect, not even in ...

  4. Copper - Wikipedia

    en.wikipedia.org/wiki/Copper

    Some lead-free solders consist of tin alloyed with a small proportion of copper and other metals. [58] The alloy of copper and nickel, called cupronickel, is used in low-denomination coins, often for the outer cladding. The US five-cent coin (currently called a nickel) consists of 75% copper and 25% nickel in homogeneous composition.

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