in which a series of similarly shaped props are given almost equal load capacity by removable devices

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CPC
E21D15/589

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Parent Industries

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

Current Industry

E21D15/589in which a series of similarly shaped props are given almost equal load capacity by removable devices

Industries

Patents Grantslast 30 patents

Information Patent Grant
3197244
- Patent number 3,197,244
- Issue date Jul 27, 1965
- E21 - EARTH DRILLING MINING
Information Patent Grant
3051431
- Patent number 3,051,431
- Issue date Aug 28, 1962
- E21 - EARTH DRILLING MINING
Information Patent Grant
2953343
- Patent number 2,953,343
- Issue date Sep 20, 1960
- E21 - EARTH DRILLING MINING