Piston ring,申请号US19380222076-传众专利搜索

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发明名称	Piston ring
摘要
申请公布号	US2148764(A)	申请公布日期	1939.02.28
申请号	US19380222076	申请日期	1938.07.30
申请人	HANS MAACK	发明人	MAACK HANS
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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