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Industry
CPC
E21D15/007
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21D
SHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS
E21D15/00
Props Chocks
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E21D15/007
spark-reducing
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Patents Grants
last 30 patents
Information
Patent Grant
Mine prop construction
Patent number
4,192,479
Issue date
Mar 11, 1980
Herbert Friebe
E21 - EARTH DRILLING MINING
Information
Patent Grant
2978353
Patent number
2,978,353
Issue date
Apr 4, 1961
F42 - AMMUNITION BLASTING
Patents Applications
last 30 patents