for step-by-step extension of the prop

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CPC
E21D15/526

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Parent Industries

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

Current Industry

E21D15/526for step-by-step extension of the prop

Industries

Patents Grantslast 30 patents

Information Patent Grant
3712572
- Patent number 3,712,572
- Issue date Jan 23, 1973
- E21 - EARTH DRILLING MINING
Information Patent Grant
1521764
- Patent number 1,521,764
- Issue date Jan 6, 1925
- B66 - HOISTING LIFTING HAULING