Permissible Mine Equipment Approved by the Bureau of Mines During 1967-68. A Supplement to Bulletin 543 and Information Circulars 8220, 8299, and 8372.
NTIS: PB 192 031 :25 pages
This publication lists permissible equipment approved by the Bureau of Mines during 1967 and 1968 (calendar years), except breathing apparatus and explosives. The purpose of this publication is to inform the public about approved equipment for use in underground mines.
IH; Information Circular;
NTIS Accession No.
NTIS: PB 192 031