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with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
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Industry
CPC
E21D15/16
This industry / category may be too specific. Please go to a parent level for more data
Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21D
SHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS
E21D15/00
Props Chocks
Current Industry
E21D15/16
with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
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