acting solely on the elements of the supports

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Patents Grantslast 30 patents

Information Patent Grant
Pivot joint for underground mining installations
- Patent number 4,242,014
- Issue date Dec 30, 1980
- Gewerkschaft Eisenhutte Westfalia
- Lubomir Plevak
- E21 - EARTH DRILLING MINING
Information Patent Grant
Roof support shield structure for use in an excavation
- Patent number 4,077,223
- Issue date Mar 7, 1978
- Rheinstahl AG
- Manfred Koppers
- E21 - EARTH DRILLING MINING
Information Patent Grant
Mine roof support and method in longwall mining of thick mineral seams
- Patent number 4,065,929
- Issue date Jan 3, 1978
- Atlantic Richfield Company
- Terry Lee Simpson
- E21 - EARTH DRILLING MINING
Information Patent Grant
3813886
- Patent number 3,813,886
- Issue date Jun 4, 1974
- E21 - EARTH DRILLING MINING
Information Patent Grant
3397544
- Patent number 3,397,544
- Issue date Aug 20, 1968
- E21 - EARTH DRILLING MINING
Information Patent Grant
3186179
- Patent number 3,186,179
- Issue date Jun 1, 1965
- E21 - EARTH DRILLING MINING
Information Patent Grant
3115754
- Patent number 3,115,754
- Issue date Dec 31, 1963
- E21 - EARTH DRILLING MINING
Information Patent Grant
2795935
- Patent number 2,795,935
- Issue date Jun 18, 1957
- E21 - EARTH DRILLING MINING