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- W2318873086 abstract "The trial combination rock bit to be used for the hard formations has had two problems in torcus, as presented on the memoir No. 1.That is, Skidding of the cutter and breakness of the middle of the bottom were reasons why it is imposible to practice effective drilling for the hard rocks.As results of the study, at last we found a way to drill the hard rocks effectively.The new trial bit (No. 5-B) consists of the diamond crown shoes, and charasteristic one cutter to crush the core in the hole, that is called D.M.C type rock bit. (PAT. 478520, pend 41-074989)Present steps of the improvement have been directed to producing the 81/2 D.M.C to use for the practical field wells." @default.
- W2318873086 created "2016-06-24" @default.
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- W2318873086 date "1967-01-01" @default.
- W2318873086 modified "2023-09-25" @default.
- W2318873086 title "A study on the Hard-Formation Bit (Continued)" @default.
- W2318873086 doi "https://doi.org/10.3720/japt.32.120" @default.
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