DIFF Subgroup
E21B 19/10 Slips; Spiders
Introduced: September 1968
Full Title
Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables > Slips; Spiders
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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