| 摘要 |
412,490. Bolts. NODIERE, V., 6, Rue des Trois Meules, St. Etienne, Loire, France. Nov. 29, 1933, No. 33422. Convention date, Dec. 3, 1932. [Class 89 (i).] A bolt has a hollow shank a and circumferential grooves c, the thickness of the parts c<1> being varied to keep the cross-sectional area at each section equal to the area at the root of the threads.
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