US3638468A - Roll-changing means for four-high rolling ...
Fukui et al. Feb. I, 1972 [54] ROLL-CHANGING MEANS FOR FOUR- [56] References Cited HIGH ROLLING MILL UNITED STATES PATENTS [72] Inventors: Eukui; Shiro lmai, both of 3,221,530 12/ 1965 Swallow et al ..72/239 Japan 3,312,096 4/1967 Stubbs et a1. ..72/23s Assignee: Ltd Tokyo Japan Beard 3,518,862 7/1970 Dehaine et al ..72/238 [22] Filed: …