for junction with the longwall coal face

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CPC
E21D11/367

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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D11/00Lining tunnels, galleries or other underground cavities

Current Industry

E21D11/367for junction with the longwall coal face

Industries

Patents Grantslast 30 patents

Information Patent Grant
3447328
- Patent number 3,447,328
- Issue date Jun 3, 1969
- E21 - EARTH DRILLING MINING