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with hydraulic or pneumatic control
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CPC
E21D15/523
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21D
SHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS
E21D15/00
Props Chocks
Current Industry
E21D15/523
with hydraulic or pneumatic control
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last 30 patents
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Patent Application
Support column installation assembly
Publication number
20060201322
Publication date
Sep 14, 2006
E. Bane Kroeger
E21 - EARTH DRILLING MINING