Method of making piston rings,申请号US19520275515-传众专利搜索

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发明名称	Method of making piston rings
摘要
申请公布号	US2668131(A)	申请公布日期	1954.02.02
申请号	US19520275515	申请日期	1952.03.08
申请人	MUSKEGON PISTON RING COMPANY	发明人	HAMM DOUGLAS W.
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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