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Window cleaner. Window cleaning, or window washing, is the exterior cleaning of architectural glass used for structural, lighting, or decorative purposes. It can be done manually, using a variety of tools for cleaning and access. Technology is also employed and increasingly, automation. Commercial work is contracted variously from in-person ...
Early skyscrapers
Skyscraper - Wikipedia ... Skyscraper
List of tallest buildings in Portland, Oregon
A mechanical floor, mechanical penthouse, mechanical layer or mechanical level is a story of a high-rise building that is dedicated to mechanical and electronics equipment. "Mechanical" is the most commonly used term, but words such as utility, technical, service, and plant are also used. They are present in all tall buildings, including the ...
Fire sprinkler system
Tower block - Wikipedia ... Tower block
List of tallest buildings in Philadelphia