YANKWICH, Chief Judge.
For several decades prior to 1945, a difficult problem in the oil industry related to "fishing tools" designed to get out of the casing or pipe in the well pipe or other obstructions. What was sought was an accurate method of locating the point at which pipe is stuck or there is an obstructing object. In well pulling work, where tubing and sucker rods were stuck at some point down in the well at an unknown depth, it became important, in order...
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