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| piercer with three rolls (A derivation of the Mannesmann tube-process has been developed, using a piercer with three rolls, which has greater accuracy and concentricity. 曼内斯曼制管法的进一步发展，开始使用三辊穿孔机，它具有更高的加工精度和同心度。) | |||
| three roll piercer | |||
| three-roll piercer | |||
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三辊 穿 孔机 : 4 phrases in 1 subject |
| Metallurgy | 4 |
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