DIFF Subgroup
E21B 34/14 operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
Introduced: January 1980
Full Title
Valve arrangements for boreholes or wells > in wells > operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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