with locking devices located near head or foot

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Patents Grantslast 30 patents

Information Patent Grant
Variable yielding mining crib support column
- Patent number 5,439,325
- Issue date Aug 8, 1995
- Mountainland Support, Inc.
- Chris D. Kitchen
- E21 - EARTH DRILLING MINING
Information Patent Grant
Collapsible crib mining support column
- Patent number 5,342,150
- Issue date Aug 30, 1994
- Mountainland Support, Inc.
- Chris D. Kitchen
- E21 - EARTH DRILLING MINING
Information Patent Grant
2893679
- Patent number 2,893,679
- Issue date Jul 7, 1959
- E21 - EARTH DRILLING MINING
Information Patent Grant
2208885
- Patent number 2,208,885
- Issue date Jul 23, 1940
- E21 - EARTH DRILLING MINING
Information Patent Grant
1979503
- Patent number 1,979,503
- Issue date Nov 6, 1934
- E21 - EARTH DRILLING MINING
Information Patent Grant
1921542
- Patent number 1,921,542
- Issue date Aug 8, 1933
- E21 - EARTH DRILLING MINING
Information Patent Grant
1818633
- Patent number 1,818,633
- Issue date Aug 11, 1931
- E21 - EARTH DRILLING MINING
Information Patent Grant
1714024
- Patent number 1,714,024
- Issue date May 21, 1929
- E21 - EARTH DRILLING MINING