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  2. Roller dam - Wikipedia

    en.wikipedia.org/wiki/Roller_dam

    The purpose of the rolling is to dissipate the energy gained by the water as it falls from the top of the dam. Otherwise the energy would be exerted downstream, causing significant bank and river bed erosion. Roller dams can be either fixed (non-moving) or active. Fixed roller dams are generally made from reinforced concrete or masonry.

  3. Bed frame - Wikipedia

    en.wikipedia.org/wiki/Bed_frame

    Hospital bed frames. A bed frame [1] or bedstead [2] is the part of a bed used to position the bed base, the flat part which in turn directly supports the mattress(es). The frame may also stop the mattress from sliding sideways, and it may include means of supporting a canopy above. There are several types of Bed Frames [3] found around

  4. Rollover protection structure - Wikipedia

    en.wikipedia.org/wiki/Rollover_protection_structure

    Some tractor operators have raised concerns about using ROPS in low-clearance environments, such as in orchards and buildings. In response, NIOSH developed an Automatically Deploying Rollover Protective Structure (AutoROPS) which stays in a lowered position until a rollover condition is determined, at which time it deploys to a fully extended and locked position.

  5. Murphy bed - Wikipedia

    en.wikipedia.org/wiki/Murphy_bed

    A Murphy bed (also known as a pull-down bed, fold-down bed, or wall bed) is a bed that is hinged at one end to store vertically against the wall, or inside a closet or cabinet. Since they often can be used as both a bed or a closet, Murphy beds are multifunctional furniture .

  6. Structural shape rolling - Wikipedia

    en.wikipedia.org/wiki/Structural_shape_rolling

    Cross-sections of continuously rolled structural shapes, showing the change induced by each rolling mill. Structural shape rolling, also known as shape rolling and profile rolling, [1] is the rolling and roll forming of structural shapes by passing them through a rolling mill to bend or deform the workpiece to a desired shape while maintaining a constant cross-section.

  7. Roller shutter - Wikipedia

    en.wikipedia.org/wiki/Roller_shutter

    Roll shutters on windows. Security roller shutters in a dead mall.. 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.

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