| 摘要 |
875,489. Screw-cutting attachments. SVENSKA PRECISIONSVERKTYG A.B. Jan. 24, 1958 [Jan. 26, 1957], No. 2398/58. Drawings to Specification. Class 83 (3). The subject-matter of this Specification is identical with that described in Specifications 875,488 and 875,490, but the claims are concerned with the means for applying axial pressure to the reverse-drive rollers. Specifications 748,091 and 830,332 also are referred to. |
