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Priority to JP1987057789UpriorityCriticalpatent/JPH0540407Y2/ja
Publication of JPS63165508UpublicationCriticalpatent/JPS63165508U/ja
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Publication of JPH0540407Y2publicationCriticalpatent/JPH0540407Y2/ja
Method and apparatus for compensating for drilling line stretch in determining equipment depth in a well and for measurement of hookload on the traveling block of a drilling rig