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  2. Fixed ladder - Wikipedia

    en.wikipedia.org/wiki/Fixed_ladder

    Stand-off brackets: Dictated by OSHA Standard 1910.27(c)(4) stand-off brackets must be at least 7" (180 mm) longer than the farthest obstruction for clearance on the back side of ladder. This means that if there is a 4" (100 mm) gutter projecting from the side of a building, a fixed ladder would have to have standoff brackets that were at least ...

  3. Crossed ladders problem - Wikipedia

    en.wikipedia.org/wiki/Crossed_ladders_problem

    1 / 1/2 ⁠ + ⁠ 1 / 1 ⁠ = ⁠ 1 / h ⁠ ∴ 2 + 1 = ⁠ 1 / h ⁠ ∴ h = ⁠ 1 / 2 + 1 ⁠ = ⁠ 1 / 3 ⁠ One side (left in the illustration) is partially folded in half and pinched to leave a mark. The intersection of a line from this mark to an opposite corner (red) with a diagonal (blue) is exactly one third from the bottom edge.

  4. Ladder - Wikipedia

    en.wikipedia.org/wiki/Ladder

    An extension ladder. A ladder is a vertical or inclined set of rungs or steps commonly used for climbing or descending. There are two types: rigid ladders that are self-supporting or that may be leaned against a vertical surface such as a wall, and rollable ladders, such as those made of rope or aluminium, that may be hung from the top.

  5. Screwfix - Wikipedia

    en.wikipedia.org/wiki/Screwfix

    Screwfix Direct Limited, trading as Screwfix, is a retailer of trade tools, accessories and hardware products based in the United Kingdom. [6] Founded in 1979 as the Woodscrew Supply Company, the company was acquired in July 1999 by Kingfisher plc , which also owns B&Q , and is listed on the London Stock Exchange .

  6. Immovable Ladder - Wikipedia

    en.wikipedia.org/wiki/Immovable_Ladder

    The Immovable Ladder is a wooden ladder leaning against a window of the Church of the Holy Sepulchre in the Old City of Jerusalem, protected from removal or alteration under the law of the Status Quo. The ladder rests on a ledge and is attached to the right window of the second tier of the facade, owned by the Armenian Apostolic Church.

  7. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    Pentalobe screw sizes include TS1 (also known as P2 or 0.8 mm, used on the iPhone 4 and subsequent models), TS4 (also known as P5 or 1.2 mm, used on the MacBook Air [since late 2010], the MacBook Pro with Retina Display and the 2015 MacBook) and TS5 (also known as P6 or 1.5 mm, used on the 2009 MacBook Pro battery).

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