| 摘要 |
1,182,928. Rolling. NIPPON KOKAN K.K. 23 Oct., 1967 [24 Oct., 1966], No. 33646/68. Divided out of 1,182,927. Heading B3M. The subject-matter of this Specification is contained in Specification 1,182,927 but the claims relate to forming the webbed steel pipe by the plug rolling operation. |
