著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Shin-ichi Nishida and Yasushi Tsukano and Masakatsu Ueno and Shunji Nishi,Last-Engaged Thread-Height Reduction of Pin Increases Fatigue Life of Drill Collar,SPE/IADC Drilling Conference,,SPE,1989-02-28,,,,https://cir.nii.ac.jp/crid/1870302167924205440,https://doi.org/10.2118/18704-ms