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  2. Water filter - Wikipedia

    en.wikipedia.org/wiki/Water_filter

    A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process. Filters cleanse water to different extents, for purposes such as: providing agricultural irrigation, accessible drinking water, public and private aquariums, and the safe use of ponds and swimming pools .

  3. Refrigerator - Wikipedia

    en.wikipedia.org/wiki/Refrigerator

    Commercial refrigerator and freezer units were in use for almost 40 years prior to the common home models. The freezer-over-refrigerator style had been the basic style since the 1940s, until modern, side-by-side refrigerators broke the trend. A vapor compression cycle is used in most household refrigerators, refrigeratorfreezers and freezers.

  4. Einstein refrigerator - Wikipedia

    en.wikipedia.org/wiki/Einstein_refrigerator

    The Einstein–Szilard or Einstein refrigerator is an absorption refrigerator which has no moving parts, operates at constant pressure, and requires only a heat source to operate. It was jointly invented in 1926 by Albert Einstein and his former student Leó Szilárd, who patented it in the U.S. on November 11, 1930 ( U.S. patent 1,781,541 ).

  5. List of watermills in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_watermills_in_the...

    Massachusetts. Dexter Grist Mill, Sandwich, built in 1654, fully restored in 1961. Jenney Grist Mill, Plymouth, built in 1969 on site of 1636 grist mill. Old Schwamb Mill, Arlington, built in 1861 with operations on the site dating to 1684. Old Stockbridge Grist Mill, Scituate, built ca. 1650. Sturbridge Village grist mill, Sturbridge, built 1939.

  6. Auto-defrost - Wikipedia

    en.wikipedia.org/wiki/Auto-defrost

    A defrost timer taken out of a household refrigerator. The defrost mechanism in a refrigerator heats the cooling element (evaporator coil) for a short period of time and melts the frost that has formed on it. [1] The resulting water drains through a duct at the back of the unit. Defrosting is controlled by an electric or electronic timer.

  7. Our pick for the best budget wireless earbuds have dropped back down to their all-time-low price. You can pick up a set of Soundcore by Anker Space A40 earbuds for $49. Engadget

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