in which the lock is also activated

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CPC
E21D15/5817

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Parent Industries

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

Current Industry

E21D15/5817in which the lock is also activated

Industries

Patents Grantslast 30 patents

Information Patent Grant
2640674
- Patent number 2,640,674
- Issue date Jun 2, 1953
- E21 - EARTH DRILLING MINING