US PATENT SUBCLASS 454 / 168
MINE


Current as of: June, 1999
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454 /   HD   VENTILATION

168MINE {3}
169  DF  .~> With partition means (e.g., brattice, etc.) {1}
171  DF  .~> Having inlet and outlet ductwork
172  DF  .~> Having inlet ductwork


DEFINITION

Classification: 454/168

MINE:

(under the class definition) Subject matter wherein an earth excavation for extracting ore or minerals is ventilated.