Piston oil ring,申请号US19450605240-传众专利搜索

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发明名称	Piston oil ring
摘要
申请公布号	US2428491(A)	申请公布日期	1947.10.07
申请号	US19450605240	申请日期	1945.07.16
申请人	GRANT GERALD M M	发明人	GRANT GERALD M. M.
分类号	F16J9/20	主分类号	F16J9/20
代理机构		代理人
主权项
地址

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