Melvyn S. J. Ennis

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Carnmoney, County Antrim, GB

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Patents Grantslast 30 patents

Information Patent Grant
Hammer drills for making boreholes
- Patent number 5,115,875
- Issue date May 26, 1992
- Melvyn S. J. Ennis
- E21 - EARTH DRILLING MINING
Information Patent Grant
Hammer drills for making boreholes
- Patent number 4,921,056
- Issue date May 1, 1990
- Melvyn S. J. Ennis
- E21 - EARTH DRILLING MINING
Information Patent Grant
Borehole drill construction
- Patent number 4,765,418
- Issue date Aug 23, 1988
- Melvyn S. J. Ennis
- E21 - EARTH DRILLING MINING
Information Patent Grant
Hammer for use in a bore hole and apparatus for use therewith
- Patent number 4,705,118
- Issue date Nov 10, 1987
- Melvyn S. J. Ennis
- E21 - EARTH DRILLING MINING