with equipment for cleaning the slit

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Patents Grantslast 30 patents

Information Patent Grant
2454446
- Patent number 2,454,446
- Issue date Nov 23, 1948
- E21 - EARTH DRILLING MINING
Information Patent Grant
2268260
- Patent number 2,268,260
- Issue date Dec 30, 1941
- E21 - EARTH DRILLING MINING
Information Patent Grant
2125296
- Patent number 2,125,296
- Issue date Aug 2, 1938
- E21 - EARTH DRILLING MINING
Information Patent Grant
1998876
- Patent number 1,998,876
- Issue date Apr 23, 1935
- E21 - EARTH DRILLING MINING
Information Patent Grant
1997093
- Patent number 1,997,093
- Issue date Apr 9, 1935
- E21 - EARTH DRILLING MINING
Information Patent Grant
1846574
- Patent number 1,846,574
- Issue date Feb 23, 1932
- E21 - EARTH DRILLING MINING
Information Patent Grant
1662800
- Patent number 1,662,800
- Issue date Mar 13, 1928
- E21 - EARTH DRILLING MINING
Information Patent Grant
1414586
- Patent number 1,414,586
- Issue date May 2, 1922
- E21 - EARTH DRILLING MINING