Machines incorporating two or more of the slitting means according to groups E21C25/02, E21C25/06, E21C25/16, E21C25/20 and E21C25/22

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Patents Grantslast 30 patents

Information Patent Grant
Unmanned intelligent mining machine
- Patent number 9,494,036
- Issue date Nov 15, 2016
- Xinping Han
- E21 - EARTH DRILLING MINING
Information Patent Grant
Continuous mining machine having core cutting assembly
- Patent number 9,476,298
- Issue date Oct 25, 2016
- Caterpillar Global Mining America LLC
- Gregory Allen McCoy
- E21 - EARTH DRILLING MINING
Information Patent Grant
Process for producing slots, grooves, and planar excavations
- Patent number 6,139,477
- Issue date Oct 31, 2000
- Ulrich Bechem
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
2737379
- Patent number 2,737,379
- Issue date Mar 6, 1956
- E21 - EARTH DRILLING MINING