Improvements in or relating to piston rings,申请号GB19550012452-传众专利搜索

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发明名称	Improvements in or relating to piston rings
摘要
申请公布号	GB768920(A)	申请公布日期	1957.02.20
申请号	GB19550012452	申请日期	1955.04.29
申请人	PERFECT CIRCLE CORPORATION	发明人
分类号	F16J9/06	主分类号	F16J9/06
代理机构		代理人
主权项
地址

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