DIFF Subgroup
E21B 31/107 using impact means for releasing stuck parts, e.g. jars
Introduced: January 1980
Full Title
Fishing for or freeing objects in boreholes or wells > using impact means for releasing stuck parts, e.g. jars
Of 2 combined children, 1 exist in both systems.
1 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1980.
Child Classifications
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