US PATENT SUBCLASS 414 / 218
.~ Including screw conveyor


Current as of: June, 1999
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414 /   HD   MATERIAL OR ARTICLE HANDLING

217  DF  APPARATUS FOR MOVING MATERIAL BETWEEN ZONES HAVING DIFFERENT PRESSURES AND INHIBITING CHANGE IN PRESSURE GRADIENT THEREBETWEEN {3}
218.~ Including screw conveyor


DEFINITION

Classification: 414/218

Including screw conveyor:

(under subclass 217) Apparatus wherein the moving and charge-inhibiting means includes a screw conveyor.