DIFF Subgroup
E21B 19/06 Elevators, i.e. rod- or tube-gripping devices
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 > Rod or cable suspensions > Elevators, i.e. rod- or tube-gripping devices
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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