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CPC
E21D9/118
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21D
SHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS
E21D9/00
Tunnels or galleries, with or without linings Methods or apparatus for making thereof Layout of tunnels or galleries
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E21D9/118
with independently driven central head
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last 30 patents
Information
Patent Grant
Machine for mechanically advancing clean cut underground mining gal...
Patent number
4,185,873
Issue date
Jan 29, 1980
Bochumer Eisenhutte Heintzmann GmbH & Co
Karlheinz Bohnes
E21 - EARTH DRILLING MINING
Information
Patent Grant
3387892
Patent number
3,387,892
Issue date
Jun 11, 1968
E21 - EARTH DRILLING MINING
Information
Patent Grant
2758825
Patent number
2,758,825
Issue date
Aug 14, 1956
E21 - EARTH DRILLING MINING