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CPC
E21D15/5817
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E
FIXED CONSTRUCTIONS
E21
Mining
E21D
SHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS
E21D15/00
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E21D15/5817
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Patents Grants
last 30 patents
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Patent Grant
2640674
Patent number
2,640,674
Issue date
Jun 2, 1953
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
CPC
E21D15/5817
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