incorporated in mine caps

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Patents Grantslast 30 patents

Information Patent Grant
Shaking control unit for a hydraulic cylinder
- Patent number 5,000,622
- Issue date Mar 19, 1991
- Bochumer Eisenhutte Heintzmann GmbH & Co. KG
- Siegmar Block
- E21 - EARTH DRILLING MINING
Information Patent Grant
Shaking control unit for a hydraulic cylinder
- Patent number 4,907,918
- Issue date Mar 13, 1990
- Bochumer Eisenhutte Heintzmann GmbH & Co. KG
- Siegmar Block
- E21 - EARTH DRILLING MINING
Information Patent Grant
Mine-roof support control mechanism
- Patent number 4,465,408
- Issue date Aug 14, 1984
- Hermann Hemscheidt Maschinenfabrik GmbH & Co.
- Karl Krieger
- E21 - EARTH DRILLING MINING
Information Patent Grant
3672174
- Patent number 3,672,174
- Issue date Jun 27, 1972
- E21 - EARTH DRILLING MINING