G - Physics – 01 – B
Patent
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G01B 5/12 (2006.01) E21B 47/00 (2006.01) E21B 47/09 (2006.01)
Patent
CA 1063513
Abstract of the Disclosure. A tubing string device for giving an indication of the location of casing collars in a cased wellbore utilizes a tubular body having a resilient sleeve mounted thereon, and axial spring means abutting the resilient sleeve.
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