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  2. Cloquet Terminal Railroad - Wikipedia

    en.wikipedia.org/wiki/Cloquet_Terminal_Railroad

    Cloquet Terminal Railroad (reporting mark CTRR) is a small Class 3 terminal railroad operating 6 miles (9.7 km) of track in Cloquet, Minnesota.The railroad interchanges with the Burlington Northern Santa Fe and Canadian Pacific railroads in Cloquet and services the Sappi Paper Mill, a USG Ceiling Tile plant and a SMI Plant on the mill site.

  3. Floor and ceiling functions - Wikipedia

    en.wikipedia.org/wiki/Floor_and_ceiling_functions

    In mathematics, the floor function is the function that takes as input a real number x, and gives as output the greatest integer less than or equal to x, denoted ⌊x⌋ or floor(x). Similarly, the ceiling function maps x to the least integer greater than or equal to x, denoted ⌈x⌉ or ceil(x). [1]

  4. USG Corporation - Wikipedia

    en.wikipedia.org/wiki/USG_Corporation

    USG Corporation, also known as United States Gypsum Corporation, is an American company which manufactures construction materials, most notably drywall and joint compound. The company is the largest distributor of wallboard in the United States and the largest manufacturer of gypsum products in North America.

  5. Dropped ceiling - Wikipedia

    en.wikipedia.org/wiki/Dropped_ceiling

    Dropped ceiling featuring ceiling tiles, lights, air diffusers, smoke detector, and more Dropped ceiling with ceiling tile light fixture. A dropped ceiling is a secondary ceiling, hung below the main (structural) ceiling. It may also be referred to as a drop ceiling, T-bar ceiling, false ceiling, suspended ceiling, grid ceiling, drop in ceiling ...

  6. Drywall - Wikipedia

    en.wikipedia.org/wiki/Drywall

    Various sized cuts of 1 ⁄ 2 in (13 mm) drywall with tools for maintenance and installation . Drywall (also called plasterboard, dry lining, [1] wallboard, sheet rock, gib board, gypsum board, buster board, turtles board, slap board, custard board, gypsum panel and gyprock) is a panel made of calcium sulfate dihydrate (), with or without additives, typically extruded between thick sheets of ...

  7. Domino tiling - Wikipedia

    en.wikipedia.org/wiki/Domino_tiling

    For some classes of tilings on a regular grid in two dimensions, it is possible to define a height function associating an integer to the vertices of the grid. For instance, draw a chessboard, fix a node A 0 {\displaystyle A_{0}} with height 0, then for any node there is a path from A 0 {\displaystyle A_{0}} to it.