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Patents Grantslast 30 patents

Information Patent Grant
Prestressing of mine props
- Patent number 5,669,739
- Issue date Sep 23, 1997
- HL&H Timber Products (Proprietary) Limited
- Graham Heath Clarke
- E21 - EARTH DRILLING MINING
Information Patent Grant
3220686
- Patent number 3,220,686
- Issue date Nov 30, 1965
- E21 - EARTH DRILLING MINING
Information Patent Grant
2938699
- Patent number 2,938,699
- Issue date May 31, 1960
- E21 - EARTH DRILLING MINING
Information Patent Grant
2928643
- Patent number 2,928,643
- Issue date Mar 15, 1960
- E21 - EARTH DRILLING MINING
Information Patent Grant
2895454
- Patent number 2,895,454
- Issue date Jul 21, 1959
- E21 - EARTH DRILLING MINING
Information Patent Grant
2864148
- Patent number 2,864,148
- Issue date Dec 16, 1958
- E21 - EARTH DRILLING MINING
Information Patent Grant
2369823
- Patent number 2,369,823
- Issue date Feb 20, 1945
- E21 - EARTH DRILLING MINING
Information Patent Grant
2351887
- Patent number 2,351,887
- Issue date Jun 20, 1944
- E21 - EARTH DRILLING MINING