Helmut Darda

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7712 Blumberg, DT

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Patents Grantslast 30 patents

Information Patent Grant
Rock-splitting apparatus
- Patent number 3,995,906
- Issue date Dec 7, 1976
- Helmut Darda
- E21 - EARTH DRILLING MINING
Information Patent Grant
Apparatus for mechanically breaking up rock
- Patent number 3,957,309
- Issue date May 18, 1976
- Helmut Darda
- E21 - EARTH DRILLING MINING