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2. Roller shutter - Wikipedia

   en.wikipedia.org/wiki/Roller_shutter

   A roller shutter, security shutter, coiling door, roller door or sectional overhead door is a specialized type of door or window shutter consisting of multiple horizontal slats, bars, or web systems interconnected through hinges. The mechanism involves lifting the door to open it and lowering it to close.

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4. News, Politics, Sports, Mail & Latest Headlines - AOL.com

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5. List of inventors - Wikipedia

   en.wikipedia.org/wiki/List_of_inventors

   Melanie Chartoff (born 1950), together with Michael Bell (born 1938), U.S. – a gray water recycling device for reuse of shower and sink water in the home; David Chaum (born 1955), U.S. – Digital signatures, ecash; Vladimir Chelomey (1914–1984), USSR – First space station ; Joyce Chen (1917–1994), China – stir fry pan

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7. Roller dam - Wikipedia

   en.wikipedia.org/wiki/Roller_dam

   Roller gates of Mississippi River Lock and Dam No. 15, the largest roller dam in the world. Roller dams are a type of weir, or a dam that is designed to allow water to flow over the top in continuous action. They are used on rivers or other such moving bodies of water where erosion damage is undesirable, yet likely to occur.