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CA638820A
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Tool for use in cementing well casing
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CA715358A
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Well pipe centering and fluid flow-course controlling device
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CA463822A
|
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Method of conditioning and cementing wells and means therefor
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CA625994A
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Stop collar for a well pipe
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CA461726A
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Method and means of conditioning the walls of a well bore
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CA627928A
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Wall scratcher for wells
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CA712868A
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Liner releasing tool
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CA606393A
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Stop collar for a well pipe
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CA715359A
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|
Turbulence generating centralizer
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CA664230A
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Friction clamp collar
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