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  2. Window cleaner - Wikipedia

    en.wikipedia.org/wiki/Window_cleaner

    Two window cleaners at work at a building in Hawaii. Windows that needed cleaning became higher as buildings became higher. A trade in window cleaning developed, for instance, in New York City in the late 19th century when early skyscrapers were being built. The height increased the risk to the washers.

  3. Skyscraper design and construction - Wikipedia

    en.wikipedia.org/wiki/Skyscraper_design_and...

    The tubular systems are fundamental to tall building design. Most buildings over 40-stories constructed since the 1960s now use a tube design derived from Khan's structural engineering principles, [ 2 ] [ 8 ] examples including the construction of the World Trade Center, Aon Center , Petronas Towers , Jin Mao Building , and most other supertall ...

  4. Skyscraper - Wikipedia

    en.wikipedia.org/wiki/Skyscraper

    The first building to use this structural system was the 35-stories Brunswick Building. [75] The Brunswick building (today known as the "Cook County Administration Building") was completed in 1965 and became the tallest reinforced concrete structure of its time. The structural system of Brunswick Building consists of a concrete shear wall core ...

  5. Exterior cleaning - Wikipedia

    en.wikipedia.org/wiki/Exterior_cleaning

    Cleaning a skyscraper on a suspended stage. Workers scrub the outside of a skyscraper in Hong Kong. Exterior cleaning is the process of cleaning a building's exterior part including the restoration of hygiene or removal of litter and/or dirt on the outside of the building. It is not to be confused with interior cleaning, the act of cleaning ...

  6. Curtain wall (architecture) - Wikipedia

    en.wikipedia.org/wiki/Curtain_wall_(architecture)

    He finally perfected the curtain wall at 900–910 Lake Shore Drive, where the curtain is an autonomous aluminum and glass skin. After 900–910, Mies's curtain wall appeared on all of his subsequent high-rise building designs, including the Seagram Building in New York. The widespread use of aluminium extrusions for mullions began during the ...

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  9. Window cleaning - Wikipedia

    en.wikipedia.org/?title=Window_cleaning&redirect=no

    This page was last edited on 15 October 2007, at 10:20 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.