with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure

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Patents Grantslast 30 patents

Information Patent Grant
Telescopic pumpable prop assembly with improved ceiling impact prop...
- Patent number 10,240,458
- Issue date Mar 26, 2019
- Cougar Can Company PTY LTD
- Craig Douglas Barnett
- E04 - BUILDING
Information Patent Grant
Support column
- Patent number 5,273,378
- Issue date Dec 28, 1993
- Volker Merz
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method of and apparatus for supporting an overburden
- Patent number 4,249,837
- Issue date Feb 10, 1981
- Heintzman GmbH & Co.
- Klaus Spies
- E21 - EARTH DRILLING MINING
Information Patent Grant
3297292
- Patent number 3,297,292
- Issue date Jan 10, 1967
- E21 - EARTH DRILLING MINING
Information Patent Grant
1674822
- Patent number 1,674,822
- Issue date Jun 26, 1928
- B66 - HOISTING LIFTING HAULING