Apparatus for making pierced forged hubs and the like
作者： Dana R Cornell
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lens.org 参考文章(5)
William P Muir, Method and apparatus for forging billets ,(1940)
Daniel Kelleher, Apparatus for working metal ,(1946)
Clarence S Swanson, Apparatus for making pierced forged hubs and the like ,(1940)
Stanley W Sparks, Method of and apparatus for extruding valves and multiflanged pipe fittings ,(1929)
William Scrimgeour, Process of drawing, forging, or swaging hollow metal articles. ,(1915)