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  2. Wall plug - Wikipedia

    en.wikipedia.org/wiki/Wall_plug

    In 1957, Oswald Thorsman from Sweden received a patent for a plastic wall plug; around the same time, German inventor Artur Fischer created the plastic Fischer wall plug. [4] [5] The Fischer wall plug, due to its innovative shape, was the first to be suitable for all wall types, and has since been the most produced and sold wall plug worldwide ...

  3. Pocket protector - Wikipedia

    en.wikipedia.org/wiki/Pocket_protector

    A pocket protector is a sheath designed to hold writing instruments and other small implements in a shirt's breast pocket, protecting it from tearing or staining. It may be used to carry pens, pencils, screwdrivers, small slide rules, and other small items. A flap over the outside of the pocket helps to secure the pocket protector.

  4. Surge protector - Wikipedia

    en.wikipedia.org/wiki/Surge_protector

    Surge protection device (SPD) for installation in a low-voltage distribution system. A surge protector, spike suppressor, surge suppressor, surge diverter, [1] surge protection device (SPD), transient voltage suppressor (TVS) or transient voltage surge suppressor (TVSS) is an appliance or device intended to protect electrical devices in alternating current (AC) circuits from voltage spikes ...

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