Polygon cone draft tube,申请号US19490075680-传众专利搜索

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发明名称	Polygon cone draft tube
摘要
申请公布号	US2668686(A)	申请公布日期	1954.02.09
申请号	US19490075680	申请日期	1949.02.10
申请人	THOMAS PERCY H	发明人	THOMAS PERCY H.
分类号	F03B11/02	主分类号	F03B11/02
代理机构		代理人
主权项
地址

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