A lawn mower (also known as a mower, grass cutter or lawnmower) is a machine utilizing one or more revolving blades to cut a grass surface to an even height. The height of the cut grass may be fixed by the design of the mower, but generally is adjustable by the operator, typically by a single master lever, or by a lever or nut and bolt on each of the machine’s wheels.
invented by Robert Stirling
A Stirling engine is a heat engine that is operated by the cyclic compression…
invented by Gustave Trouve
A metal detector is an instrument that detects the presence of metal nearby.…
invented by Thomas Edison
An electric light is a device that produces visible light from electric power.…
invented by Francois Coignet
Reinforced concrete (RC), also called reinforced cement concrete (RCC), is a…
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