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Jigging machine

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

Jigging \Jig"ging\, n. (Mining)
   The act or using a jig; the act of separating ore with a
   jigger, or wire-bottomed sieve, which is moved up and down in
   water.

   {Jigging machine}.
   (a) (Mining) A machine for separating ore by the process of
       jigging.
   (b) (Metal Working) A machine with a rotary milling cutter
       and a templet by which the action of the cutter is guided
       or limited; -- used for forming the profile of an
       irregularly shaped piece; a profiling machine.
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