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Knife-edge file

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Knife-edge \Knife"-edge`\, n. (Mech.)
   A piece of steel sharpened to an acute edge or angle, and
   resting on a smooth surface, serving as the axis of motion of
   a pendulum, scale beam, or other piece required to oscillate
   with the least possible friction.

   {Knife-edge file}. See Illust. of {File}.
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