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Trimmers that have nylon or metal blades usually have straight drive shafts because of the higher torque required to turn the disk and because of the shock loads that are passed back from the blade to the drive shaft and its gearbox(es). Smaller line trimmers have curved driveshafts to make holding the cutting-head at ground level much easier and with less strain on the operator.The lawnmower is defined as a hand-operated or power-operated machine with rotary blades for cutting grass on lawns. [1] To make the process of cutting grass easier over the ages, many individuals have added onto the original design to add speed, efficiency, and power. Before the first lawnmower was invented, the use of grazing animals and hand held clippers were the only way of having a kept lawn.
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