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hair clipper
Hair clippers are specialized implements used to cut human head hair. They work on the same principle as scissors, but are distinct from scissors themselves and razors. Similar but heavier-duty implements are used to shear sheep, but are called handpieces or machine shears.
==Operating principle==
Hair clippers comprise a pair of sharpened comb-like blades in close contact one above the other which slide sideways relative to each other, a mechanism which may be manual or electrical to make the blades oscillate from side to side, and a handle. The clipper is moved so that hair is positioned between the teeth of the comb, and cut with a scissor action when one blade slides sideways relative to the other. Friction between the blades needs to be as low as possible, which is attained by choice of material and finish, and frequent lubrication.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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