CPC Subgroup
E21B 33/126 with fluid-pressure-operated elastic cup or skirt (E21B33/122, E21B33/124 take precedence)
Full Title
Sealing or packing boreholes or wells > in the borehole > Packers; Plugs (used for cementing E21B33/134, E21B33/16) > with fluid-pressure-operated elastic cup or skirt (E21B33/122, E21B33/124 take precedence)
1 direct subcode
Child Classifications
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