Apparatus for providing a ridge on a pipe of ductile material,申请号US19470739230-传众专利搜索

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发明名称	Apparatus for providing a ridge on a pipe of ductile material
摘要
申请公布号	US2445303(A)	申请公布日期	1948.07.13
申请号	US19470739230	申请日期	1947.04.03
申请人	SIR W. G. ARMSTRONG WHITWORTH AIRCRAFT LIMITED	发明人	FISHER MARK
分类号	B21D17/04	主分类号	B21D17/04
代理机构		代理人
主权项
地址

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