Auxiliary devices in which the prop type is not essential

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Patents Grantslast 30 patents

Information Patent Grant
Positioning cradle for mine roof supports
- Patent number 6,612,803
- Issue date Sep 2, 2003
- Strata Products (USA), Inc.
- Clifford A. McCartney
- B66 - HOISTING LIFTING HAULING
Information Patent Grant
Arrangement for erecting columnar supporting elements for undergrou...
- Patent number 4,332,512
- Issue date Jun 1, 1982
- Bochumer Eisenhuette Heintzmann GmbH & Co.
- Peter Heintzmann
- E21 - EARTH DRILLING MINING
Information Patent Grant
3625465
- Patent number 3,625,465
- Issue date Dec 7, 1971
- E21 - EARTH DRILLING MINING
Information Patent Grant
2816728
- Patent number 2,816,728
- Issue date Dec 17, 1957
- E21 - EARTH DRILLING MINING
Information Patent Grant
2185561
- Patent number 2,185,561
- Issue date Jan 2, 1940
- E21 - EARTH DRILLING MINING