for use in longwall working

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CPC
E21D17/04

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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D17/00Caps for supporting mine roofs

Current Industry

E21D17/04for use in longwall working

Industries

Patents Grantslast 30 patents

Information Patent Grant
3408820
- Patent number 3,408,820
- Issue date Nov 5, 1968
- E21 - EARTH DRILLING MINING
Information Patent Grant
3364682
- Patent number 3,364,682
- Issue date Jan 23, 1968
- E21 - EARTH DRILLING MINING