Piston, ring, and ring expander,申请号US19370142851-传众专利搜索

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法人/股东/高管

发明名称	Piston, ring, and ring expander
摘要
申请公布号	US2170970(A)	申请公布日期	1939.08.29
申请号	US19370142851	申请日期	1937.05.15
申请人	JOHNSTON CHARLES F	发明人	JOHNSTON CHARLES F.
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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