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A pressure washer is used to remove old paint from a boat. Patio flagstones being pressure washed using a rotary nozzle. Pressure washing or power washing is the use of high-pressure water spray to remove loose paint, mold, grime, dust, mud, and dirt from surfaces and objects such as buildings, vehicles and concrete surfaces.
In 1950, the cleaning technology division was established with the development of the first European hot water high-pressure cleaner, the DS 350. [11] From the mid-1950s to the 1970s, the production of steam generators for industry and construction was a key focus for the company, while cleaning technology only later became Kärcher's main revenue-generating sector.
The Kärcher RC 3000 was a robotic vacuum cleaner created by Kärcher in 2002, and manufactured until January 2015. [ 1 ] [ 2 ] Unlike other robotic vacuum cleaners of the time, the RC 3000 was designed with a self-service station that allows owners to keep their robots running (without human intervention) for longer periods of time.
In 1860 a manual vacuum cleaner was invented by Daniel Hess of West Union, Iowa. Called a "carpet sweeper", it gathered dust with a rotating brush and had a bellows for generating suction. [4] [5] Another early model (1869) was the "Whirlwind", invented in Chicago in 1868 by Ives W. McGaffey. The bulky device worked with a belt driven fan ...
Construction is a major source of employment in most countries; high reliance on small businesses, and under-representation of women are common traits. For example: In the US, construction employed around 11.4m people in 2020, with a further 1.8m employed in architectural, engineering, and related professional services – equivalent to just ...
It is commonly used for indoor home/business flooring, outdoor patio flooring, spa walls and ceilings, façades, and wall cladding. The lobby walls of the modernist Willis Tower (1970) (formerly Sears Tower) in Chicago are made of travertine. [79] Architect Welton Becket frequently incorporated travertine into many of his projects. [80]
Manual cleaning tools are by far the most prevalent method of cleaning, most likely because of the low purchase cost. However, in a Saudi Arabian study done in 2014, it was found that "installed robotic systems, mechanized systems, and installed hydraulic systems are likely the three most promising technologies for use in cleaning solar panels".
For example, the lower floor columns of high-rise concrete buildings may use concrete of 80 MPa (11,600 psi) or more, to keep the size of the columns small. Bridges may use long beams of high-strength concrete to lower the number of spans required. [107] [108] Occasionally, other structural needs may require high-strength concrete. If a ...
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