| 摘要 |
372,252. Lathe &c. centres. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Kerr, T. ; 1241, Parkwood Boulevard, Schenectady, New York, U.S.A.) Dec. 31, 1931, No. 36099. Convention date, Jan. 2. [Class 83 (iii).] A dead-centre having a hard metal cap and soft steel shank has ribs provided on the interior of the cap to facilitate fitting to the shank. The ribs 3 may also be fitted into slots 6 formed in the shank, Fig. 3. The composition of materials used and the method of making the centre are similar to that described in Specification 359,303 which is referred to. |
