HDRK Mining Research Limited

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Copper Cliff, CA

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Patents Grantslast 30 patents

Information Patent Grant
Automatic control system and method for a machine used for excavati...
- Patent number 5,938,288
- Issue date Aug 17, 1999
- HDRK Mining Research Limited
- Jacques Andre Saint-Pierre
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method and machine for excavating drifts, tunnels, stopes, caverns...
- Patent number 5,340,199
- Issue date Aug 23, 1994
- HDRK Mining Research Limited
- Wilfried Piefenbrink
- E21 - EARTH DRILLING MINING
Information Patent Grant
Loose rock detector
- Patent number 5,024,090
- Issue date Jun 18, 1991
- HDRK Mining Research Limited
- Michel J. Pettigrew
- G01 - MEASURING TESTING