specially adapted for removing overhanging coal

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Patents Grantslast 30 patents

Information Patent Grant
Mechanized scaling bar
- Patent number 5,409,300
- Issue date Apr 25, 1995
- Claude Bourgoin
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method and apparatus for scaling mine roofs and ribs
- Patent number 5,407,252
- Issue date Apr 18, 1995
- Carey Salt Company, Inc.
- Huey P. Perero
- E21 - EARTH DRILLING MINING
Information Patent Grant
3441317
- Patent number 3,441,317
- Issue date Apr 29, 1969
- E21 - EARTH DRILLING MINING
Information Patent Grant
3333898
- Patent number 3,333,898
- Issue date Aug 1, 1967
- E21 - EARTH DRILLING MINING
Information Patent Grant
3306665
- Patent number 3,306,665
- Issue date Feb 28, 1967
- E21 - EARTH DRILLING MINING
Information Patent Grant
1283177
- Patent number 1,283,177
- Issue date Oct 29, 1918
- E21 - EARTH DRILLING MINING