CPC Subgroup
E21B 19/16 Connecting or disconnecting pipe couplings or joints (E21B19/20 takes precedence)
Full Title
Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables > Connecting or disconnecting pipe couplings or joints (E21B19/20 takes precedence)
4 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open