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  2. Ladder - Wikipedia

    en.wikipedia.org/wiki/Ladder

    Rigid ladders were originally made of wood, but in the 20th century aluminium became more common because of its lighter weight. Ladders with fiberglass stiles are used for working on or near overhead electrical wires, because fiberglass is an electrical insulator. [5] Henry Quackenbush patented the extension ladder in 1867. [6]

  3. Wing Enterprises - Wikipedia

    en.wikipedia.org/wiki/Wing_Enterprises

    Wing Enterprises is an American company headquartered in Springville, Utah company, the largest American manufacturer of ladders as of 2005. [1] The company produces the Little Giant Ladder System, a convertible aluminium ladder system. The founder of Wing Enterprises, Harold Ray "Hal" Wing, came across a prototype of the ladder in Germany in

  4. Fixed ladder - Wikipedia

    en.wikipedia.org/wiki/Fixed_ladder

    Aluminum: This metal is corrosion-resistant and lightweight, making it an ideal; Steel: Another sturdy metal, steel is also used for fixed ladders. However, it must be treated to resist corrosion. [1] Fiberglass: Lighter than wood but sturdier than aluminum, this material is non-conductive and ideal for use for electrical work.

  5. Overhead power line - Wikipedia

    en.wikipedia.org/wiki/Overhead_power_line

    In the area surrounding the overhead lines it is dangerous to risk interference; e.g. flying kites or balloons, using ladders or operating machinery. Overhead distribution and transmission lines near airfields are often marked on maps, and the lines themselves marked with conspicuous plastic reflectors, to warn pilots of the presence of conductors.

  6. Cable tray - Wikipedia

    en.wikipedia.org/wiki/Cable_tray

    In the electrical wiring of buildings, a cable tray system is used to support insulated electrical cables used for power distribution, control, and communication. Cable trays are used as an alternative to open wiring or electrical conduit systems, and are commonly used for cable management in commercial and industrial construction.

  7. Sutphen - Wikipedia

    en.wikipedia.org/wiki/Sutphen

    The Fire Department of New York purchased two Sutphen 100+ tower ladder quints in 1981. They were the tallest tower ladders in the city [15] until they were taken out of service. Aerialscope only sold 75 foot towers until they developed 95 foot versions in 1985. The patch of Ladder 119 in Brooklyn still has an image of their Sutphen.

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