Robert J. Hopley

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Germiston, ZA

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Patents Grantslast 30 patents

Information Patent Grant
Mining method
- Patent number 4,458,947
- Issue date Jul 10, 1984
- Boart International Limited
- Robert J. Hopley
- E21 - EARTH DRILLING MINING
Information Patent Grant
Borehole guide and method of boring interpenetrating holes
- Patent number 4,432,422
- Issue date Feb 21, 1984
- Boart International, Limited
- Robert J. Hopley
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR