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In 1991, Milwaukee released the Milwaukee Super Sawzall, a reciprocating saw with built-in counterbalance, a gear-protecting clutch, and five different patents. In the later 1990s, Milwaukee Electric Tool Corporation released a new range of miter saws and a lineup of 18-volt contractor cordless tools. [7]
Andreas Stihl designed and hand built his first chainsaw in 1926. [5] The saw was electrically powered, and weighed about 48 kg (106 lb). [6] Stihl grew slowly initially, as the chainsaws came to the market about the same time as the Great Depression; with manpower cheap, and old two-man saws proven, there was no need for power saws.
The most common types of power tools use electric motors. Internal combustion engines and compressed air are also commonly used. Tools directly driven by animal power are not generally considered power tools. Power tools can produce large amounts of particulates, including ultrafine particles. Airborne particulate matter is a Group 1 carcinogen.
Chainsaws have almost entirely replaced simple man-powered saws in forestry. They are made in many sizes, from small electric saws intended for home and garden use, to large "lumberjack" saws. Members of military engineer units are trained to use chainsaws, as are firefighters to fight forest fires and to ventilate structure fires. [citation ...
A typical one-line diagram with annotated power flows. Red boxes represent circuit breakers, grey lines represent three-phase bus and interconnecting conductors, the orange circle represents an electric generator, the green spiral is an inductor, and the three overlapping blue circles represent a double-wound transformer with a tertiary winding.
In 1929, Andreas Stihl married Mia Giersch (1903-2002), [2] with whom he had four children, among them Hans Peter Stihl (born 1932) and Eva Mayr-Stihl (born 1935), who succeeded her father in managing the company and remaining Vorstand until 2002. [9] Stihl divorced his first wife in 1960, and married Hannelore Wegener-Doberg (1927-2009) the ...
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Single-wire earth return (SWER) or single-wire ground return is a single-wire transmission line which supplies single-phase electric power from an electrical grid to remote areas at lowest cost. The earth (or sometimes a body of water) is used as the return path for the current, to avoid the need for a second wire (or neutral wire ) to act as a ...