Friction spring unit,申请号US19390276298-传众专利搜索

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发明名称	Friction spring unit
摘要
申请公布号	US2234988(A)	申请公布日期	1941.03.18
申请号	US19390276298	申请日期	1939.05.29
申请人	CARDWELL-WESTINGHOUSE COMPANY	发明人	SPROUL DONALD F.
分类号	B61F5/12	主分类号	B61F5/12
代理机构		代理人
主权项
地址

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