using explosive means

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Patents Grantslast 30 patents

Information Patent Grant
3477525
- Patent number 3,477,525
- Issue date Nov 11, 1969
- E21 - EARTH DRILLING MINING
Information Patent Grant
3411595
- Patent number 3,411,595
- Issue date Nov 19, 1968
- E21 - EARTH DRILLING MINING
Information Patent Grant
3345879
- Patent number 3,345,879
- Issue date Oct 10, 1967
- E21 - EARTH DRILLING MINING
Information Patent Grant
3331453
- Patent number 3,331,453
- Issue date Jul 18, 1967
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
3313357
- Patent number 3,313,357
- Issue date Apr 11, 1967
- E21 - EARTH DRILLING MINING
Information Patent Grant
3301336
- Patent number 3,301,336
- Issue date Jan 31, 1967
- E21 - EARTH DRILLING MINING
Information Patent Grant
3280633
- Patent number 3,280,633
- Issue date Oct 25, 1966
- E21 - EARTH DRILLING MINING
Information Patent Grant
3155174
- Patent number 3,155,174
- Issue date Nov 3, 1964
- E21 - EARTH DRILLING MINING
Information Patent Grant
3098533
- Patent number 3,098,533
- Issue date Jul 23, 1963
- E21 - EARTH DRILLING MINING
Information Patent Grant
2691939
- Patent number 2,691,939
- Issue date Oct 19, 1954
- E21 - EARTH DRILLING MINING
Information Patent Grant
2638321
- Patent number 2,638,321
- Issue date May 12, 1953
- E21 - EARTH DRILLING MINING
Information Patent Grant
2048677
- Patent number 2,048,677
- Issue date Jul 28, 1936
- F42 - AMMUNITION BLASTING