the lock also being activated

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Industry

CPC
E21D15/588

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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D15/00Props Chocks

Current Industry

E21D15/588the lock also being activated

Industries

Patents Grantslast 30 patents

Information Patent Grant
3051431
- Patent number 3,051,431
- Issue date Aug 28, 1962
- E21 - EARTH DRILLING MINING
Information Patent Grant
2938699
- Patent number 2,938,699
- Issue date May 31, 1960
- E21 - EARTH DRILLING MINING
Information Patent Grant
2928643
- Patent number 2,928,643
- Issue date Mar 15, 1960
- E21 - EARTH DRILLING MINING