Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
CPC Subgroup
E21B 19/086

with a fluid-actuated cylinder (E21B19/084, E21B19/087, E21B19/09 take 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 > Apparatus for feeding the rods or cables (E21B19/22 takes precedence; automatic feed E21B44/02); Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods > with a fluid-actuated cylinder (E21B19/084, E21B19/087, E21B19/09 take precedence)