| 摘要 |
1,067,184. Making threaded members. CATERPILLAR TRACTOR CO. Nov. 4, 1965 [Nov. 27, 1964], No. 46736/65. Heading B3A. [Also in Division F2] A threaded member, e.g. a bolt or stud, is formed with a hardened core and a tempered outer casing in which the threads are formed. The threads are formed either in the throughhardened blank before tempering or the blank is tempered before the threads are formed. |
