shearout ball seat sub
... shearometer 切力仪 shearout ball seat sub 剪切球座接头 shears 剪刀;剪床;起重三角架 ...
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采用剪切球座配合接头,能够确保投球从地面投放或送入到位;
Shear sleeve adapter allows ball to be run in place or dropped from surface;
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