US PATENT SUBCLASS 454 / 170
.~.~ Flexible sheet

Current as of: June, 1999
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454 /   HD   VENTILATION

168  DF  MINE {3}
169  DF  .~ With partition means (e.g., brattice, etc.) {1}
170.~.~ Flexible sheet

DEFINITION

Classification: 454/170

Flexible sheet:

(under subclass 169) Subject matter wherein the flow resisting means comprises a pliable fabric or material.

(1) Note. The pliable fabric or material may be cloth, canvas, a synthetic sheeting, etc.