Testing safety catches on mine cages, Lake Superior district.

Creator Personal:

Cash, Frank E. (Frank Errette), Pearce, Clyde M.

Title:

Testing safety catches on mine cages, Lake Superior district.

Call Number:

P19476

Date:

1945

Description:

Serial issue. Issued as: United States. Bureau of Mines. Information circular, 7325 (1945:June).

Subject Topical:

Iron mines and mining--Safety appliances--Lake States--Equipment and supplies.