Ventilation control system
United States Patent 2947239
US Patent References:
Ventilating curtain for mines
- - 1778979

Means for supporting mine brattices
- - 2395689

Mine door structure
- - 2621725


Inventors:
Vincent, Burgess James
Publication Date:
08/02/1960
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Assignee:
Vincent, Burgess James
Primary Class:
454/170
International Classes:
E21F1/14; E21F1/00