Harold D. Keith

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Rolla, MO, US

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Patents Grantslast 30 patents

Information Patent Grant
Expansion bolt and mine roof reinforcement
- Patent number 4,954,017
- Issue date Sep 4, 1990
- The Curators of the University of Missouri
- Robert L. Davis
- E21 - EARTH DRILLING MINING
Information Patent Grant
Expansion bolt and mine roof reinforcement therewith
- Patent number 4,636,115
- Issue date Jan 13, 1987
- The Curators of the University of Missouri
- Robert L. Davis
- E21 - EARTH DRILLING MINING