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Gravely, of Brillion, Wisconsin, is a manufacturer of powered lawn and garden implements which it describes as "walk-behind, zero turn and outfront mowers". [1] It started as a manufacturer of "walk-behind" or two-wheel tractors.
The company was founded by William J. Niederkorn in 1922, and started building walk-behind two-wheeled tractors in 1939. Between 1941 and 1945, due to World War II , Simplicity Manufacturing temporarily halted production of lawn and garden products, and manufactured electric fence controllers and external surface grinders to satisfy the War ...
Every walk-behind mower sold in the US since 1982 has a dead man's switch called an "operator-presence control", which by law must stop the blades within three seconds after the user releases the controls. [9] Attached across the handle is a mechanical lever connected by a flexible cable to the kill switch on the engine.
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Riding mowers (U.S. and Canada) or ride-on mowers (U.K. and Canada) are a popular alternative for large lawns. The operator is provided with a seat and controls on the mower and literally rides on the machine. Most use the horizontal rotating blade system, though usually with multiple blades. A common form of ride-on mower is the lawn tractor.
The 4240, 4440, 4640, and 4840 featured a new 466-cubic-inch displacement engine, and improvements to the cab including an optional hydraulic seat for a smoother ride. The Sound Gard body and 8-speed Power Shift transmission were standard equipment on the 4840. In 1983, Deere introduced the 4050, 4250, 4450, 4650, and 4850.