CPC Subgroup
E21B 33/16 using plugs for isolating cement charge; Plugs therefor
Full Title
Sealing or packing boreholes or wells > in the borehole > Methods or devices for cementing, for plugging holes, crevices or the like > for cementing casings into boreholes > using plugs for isolating cement charge; Plugs therefor
2 direct subcodes
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