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The most common self-contained power source for lawn mowers is a small 4-stroke (typically one-cylinder) internal combustion engine. Smaller mowers often lack any form of self-propulsion, requiring human power to move over a surface; "walk-behind" mowers are self-propelled, requiring a human only to walk behind and guide them.
Simplicity Manufacturing Company is an American company based in Port Washington, Wisconsin that builds lawn and garden equipment under various brands. The company was founded by William J. Niederkorn in 1922, and started building walk-behind two-wheeled tractors in 1939.
Tools were just a start; the item that set him apart was the self-scouring steel plow, which was pioneered in 1837 when John Deere fashioned a Scottish steel saw blade into a plow. [6] Prior to Deere's steel plow, most farmers used iron or wooden plows to which the rich Midwestern soil stuck, so they had to be cleaned frequently.
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A commercial zero-turn lawn mower with two pivoting front wheels. A zero-turn riding lawn mower (colloquially, a z-turn or zero turn) is a standard riding lawn mower with a turning radius that is effectively zero when the two drive wheels rotate in opposite direction, like a tank turning in place.
This term is coined by Professor Hans Moravec, Principal Research Scientist at the Carnegie Mellon University Robotics Institute in describing the near future evolution of robot technology. First-generation robots, Moravec predicted in 1997, should have an intellectual capacity comparable to perhaps a lizard and should become available by 2010.