Chamfer slotting pipe,申请号US19290388187-传众专利搜索

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发明名称	Chamfer slotting pipe
摘要
申请公布号	US1868900(A)	申请公布日期	1932.07.26
申请号	US19290388187	申请日期	1929.08.24
申请人	GENERAL PETROLEUM CORPORATION OF CALIFORNIA	发明人	HAYES HARRY
分类号	B21D28/28	主分类号	B21D28/28
代理机构		代理人
主权项
地址

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