with longitudinally-divided upper or lower prop parts

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Patents Grantslast 30 patents

Information Patent Grant
Mine support post
- Patent number 5,228,810
- Issue date Jul 20, 1993
- Ben L. Seegmiller
- E21 - EARTH DRILLING MINING
Information Patent Grant
Yieldable mine post system
- Patent number 5,215,411
- Issue date Jun 1, 1993
- Ben L. Seegmiller
- E21 - EARTH DRILLING MINING
Information Patent Grant
Yieldable mine post
- Patent number 5,015,125
- Issue date May 14, 1991
- Ben L. Seegmiller
- E21 - EARTH DRILLING MINING
Information Patent Grant
2911181
- Patent number 2,911,181
- Issue date Nov 3, 1959
- E21 - EARTH DRILLING MINING
Information Patent Grant
2883179
- Patent number 2,883,179
- Issue date Apr 21, 1959
- B60 - VEHICLES IN GENERAL
Information Patent Grant
2136441
- Patent number 2,136,441
- Issue date Nov 15, 1938
- E21 - EARTH DRILLING MINING
Information Patent Grant
1770978
- Patent number 1,770,978
- Issue date Jul 22, 1930
- E21 - EARTH DRILLING MINING