DIFF Subgroup
E21B 31/113 hydraulically-operated
Introduced: January 1980
Title
Titles differ between systems:
IPC: hydraulically operated
CPC: hydraulically-operated
Full Title
Full titles differ between systems:
IPC:
Fishing for or freeing objects in boreholes or wells > using impact means for releasing stuck parts, e.g. jars > hydraulically operated
CPC:
Fishing for or freeing objects in boreholes or wells > using impact means for releasing stuck parts, e.g. jars > hydraulically-operated
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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