CPC Subgroup
E21B 33/10 in the borehole
Full Title
Sealing or packing boreholes or wells > in the borehole
2 direct subcodes
Child Classifications
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- E21B 33/12 Packers; Plugs (used for cementing E21B33/134, E21B33/16)
- E21B 33/13 Methods or devices for cementing, for plugging holes, crevices or the like