| Patents for B21B 25 - Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group; Accessories or auxiliary means therefor (1,103) | |
|---|---|
| 05/1976 | |
| 05/11/1976 | US3955392 Device for changing mandrels in tube rolling mills |
| 03/1976 | |
| 03/30/1976 | US3946586 Process and apparatus for rolling seamless tubes |
| 01/1976 | |
| 01/13/1976 | US3931724 Plug-retaining device for use in piercing and plugging mills |