US PATENT SUBCLASS 454 / 168
MINE
Current as of:
June, 1999
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454 /
HD
VENTILATION
168
MINE
{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.
