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  2. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    [18]: 61 [19] In addition, a well-designed system will often use two 45° elbows instead of one 90° elbow (even a sweep 90° elbow) to reduce flow disruption as much as possible. [ 18 ] : 61 Central vacuum system inlet fittings are intentionally designed with a tighter curvature radius than other bends in the system.

  3. Barbed wire - Wikipedia

    en.wikipedia.org/wiki/Barbed_wire

    The first patent in the United States for barbed wire [1] was issued in 1867 to Lucien B. Smith of Kent, Ohio, who is regarded as the inventor. [ 2 ] [ 3 ] Joseph F. Glidden of DeKalb, Illinois , received a patent for the modern invention [ 4 ] in 1874 after he made his own modifications to previous versions.

  4. Detergent enzymes - Wikipedia

    en.wikipedia.org/wiki/Detergent_enzymes

    For stain removal, conventional household washing machines use heated water, as this increases the solubility of stains. However, heating the water to the required temperature uses a considerable amount of energy; energy usage can be reduced by using detergent enzymes which perform well in cold water, allowing low-temperature washes and ...

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