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J
jaw crusher - (2) a primary crusher designed to reduce large
rocks or ores to sizes capable of being handled by a secondary crusher.
It consists of a moving jaw, hinged at one end, which swings toward
and away from a stationary jaw in a regular oscillatory cycle.
jig - (1)(2) a machine in which the feed is stratified in
water by means of a pulsating motion and from which the stratified
products are separately removed; the pulsating motion usually being
obtained by alternate upward and downward currents of water.
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