Annular sealing device,申请号US19310522703-传众专利搜索

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发明名称	Annular sealing device
摘要
申请公布号	US1938249(A)	申请公布日期	1933.12.05
申请号	US19310522703	申请日期	1931.03.14
申请人	FRETTER NATHAN F	发明人	FRETTER NATHAN F.
分类号	F16C33/74;F16J15/32	主分类号	F16C33/74
代理机构		代理人
主权项
地址

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