Ingemar Niemi

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Malmberget, SE

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Patents Grantslast 30 patents

Information Patent Grant
Apparatus for driving an upwardly directed shaft in rock
- Patent number 4,986,374
- Issue date Jan 22, 1991
- Gruvprodukter I Gallivare AB
- Ingemar Niemi
- E21 - EARTH DRILLING MINING