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  2. Manhole cover - Wikipedia

    en.wikipedia.org/wiki/Manhole_cover

    By contrast, the heaviest class F900 manhole cover can withstand a maximum weight of 90 tons, making it suitable for docks, airports, and other extreme heavy-duty applications. [ 31 ] EN 124 does not apply for gratings of prefabricated drainage channels (according to EN 1433) or floor and roof gullies in buildings (specified in EN 1253-1).

  3. Expert: Newly acquired NOLA street barriers inadequate for ...

    www.aol.com/news/expert-newly-acquired-nola...

    The New Orleans City Council has launched an investigation to examine the city's current barriers, which include the Heald HT2 Matador system and the newly acquired RCS8040 S10 removable bollards.

  4. Bollard - Wikipedia

    en.wikipedia.org/wiki/Bollard

    Figural bollard sculptures in Geelong, Victoria Ex libris bollard outside Cambridge University Library, by Harry Gray. In Geelong, Victoria, Australia, decorative bollards, sculpted and painted by Jan Mitchell, are placed around the city to enhance the landscape as a form of outdoor public sculpture. Usually they are made of timber, minimally ...

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  6. Guard rail - Wikipedia

    en.wikipedia.org/wiki/Guard_rail

    Staircase railings in the Degré du roi, part of the Petit appartement du roi, in the Palace of Versailles, Versailles, France. Guard rails, guardrails, railings or protective guarding, [1] in general, are a boundary feature and may be a means to prevent or deter access to dangerous or off-limits areas while allowing light and visibility in a greater way than a fence.

  7. Bollard pull - Wikipedia

    en.wikipedia.org/wiki/Bollard_pull

    Bollard pull is a conventional measure of the pulling (or towing) power of a watercraft.It is defined as the force (usually in tonnes-force or kilonewtons (kN)) exerted by a vessel under full power, on a shore-mounted bollard through a tow-line, commonly measured in a practical test (but sometimes simulated) under test conditions that include calm water, no tide, level trim, and sufficient ...

  8. Retractable roof - Wikipedia

    en.wikipedia.org/wiki/Retractable_roof

    A retractable roof is a roof system designed to roll back the roof of a structure so that the interior of the facility is open to the outdoors. [1] Retractable roofs are sometimes referred to as operable roofs or retractable skylights.

  9. Boat building - Wikipedia

    en.wikipedia.org/wiki/Boat_building

    Also called "bollards". Bilge: the lowest part of the interior of a hull. Water, fuel tanks, ballast, and heavy stores are variously placed in the bilge to lower the craft's centre of gravity. Bilge keels: a pair of short keels fitted on either side of the hull. Less hydro-dynamically efficient than a fin keel, they have a shallower draft.

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