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9 results returnedProgress report on investigation of detachable rock-drill bits
Progress report no. 2 on investigation of detachable rock-drill bits
Progress report 4 on investigation of detachable rock-drill bits
Progress report no. 3 on investigation of detachable rock-drill bits
Diamond-drilling blast holes, eastern Magnetite Mine A
Diamond drilling blast holes, Balmat Mine, St. Lawrence County, N.Y.
Shaft sinking by diamond drilling, Bellefonte mine, National Gypsum Co., Centre County, Pa.
Diamond-drilling blast holes, Bellefonte Mine, National Gypsum Co., Centre County, Pa.
Published Year
Subject
- Rock-drills (9) *
- Bits (Drilling and boring) (4)
- Drilling and boring (4)
- Blasting (3)
- Boring machinery (3)
- Diamond bits (2)
- Boring (1)
- Magnetite (1)
- Magnetite mines and mining--Equipment and supplies (1)
- Mines and mineral resources (1)
- Mines and mineral resources--Pennsylvania--Centre--Equipment and supplies (1)
- Shaft sinking--Equipment and supplies (1)
- Zinc mines and mining--New York (State)--Saint Lawrence County--Equipment and supplies (1)
Author
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