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  2. Floor drain - Wikipedia

    en.wikipedia.org/wiki/Floor_drain

    Floor drain system in bathroom, Korea. A floor drain is a plumbing fixture that is installed in the floor of a structure, mainly designed to remove any standing water near it. They are usually round, but can also be square or rectangular. They usually range from 2 to 12 inches (5.1 to 30.5 cm); most are 4 inches (10 cm) in diameter.

  3. Marston Mat - Wikipedia

    en.wikipedia.org/wiki/Marston_mat

    RAF aircrew with one of their Bristol Beaufighters on a PSP airstrip at Biferno, Italy, August 1944. Marston Mat, more properly called pierced (or perforated) steel planking (PSP), is standardized, perforated steel matting material developed by the United States at the Waterways Experiment Station shortly before World War II, primarily for the rapid construction of temporary runways and ...

  4. Grating - Wikipedia

    en.wikipedia.org/wiki/Grating

    Duty Cycle is the relative thickness of high and low lines. The duty cycle is the ratio of the width of the low line (black or opaque) to one whole grating period. Profile is the shape of the repeating pattern, which is typically a square wave but can also be any periodic pattern (sine wave, triangle wave, sawtooth wave, etc.).

  5. Gargoyle - Wikipedia

    en.wikipedia.org/wiki/Gargoyle

    Gargoyles of Notre-Dame de Paris Dragon-headed gargoyle of the Tallinn Town Hall, Estonia Gargoyle of the Vasa Chapel at Wawel in Kraków, Poland. In architecture, and specifically Gothic architecture, a gargoyle (/ ˈ ɡ ɑːr ɡ ɔɪ l /) is a carved or formed grotesque [1]: 6–8 with a spout designed to convey water from a roof and away from the side of a building, thereby preventing it ...

  6. Coal hole - Wikipedia

    en.wikipedia.org/wiki/Coal_hole

    A selection of coal hole covers from Gordon Square, London and surrounding streets. A coal hole is a hatch in the pavement (sidewalk, in US usage) above an underground coal bunker.

  7. Cattle grid - Wikipedia

    en.wikipedia.org/wiki/Cattle_grid

    A cattle grid on a country road in the Yorkshire Dales Cattle grid on a railway line in northeastern New Mexico Cattle grid in Galong, Australia. A cattle grid – also known as a stock grid in Australia; cattle guard, or cattle grate in American English; vehicle pass, or stock gap in the Southeastern United States; [1] Texas gate in western Canada and the northwestern United States; [2] and a ...

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