Two-speed bicycle transmission,申请号US19370126216-传众专利搜索

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发明名称	Two-speed bicycle transmission
摘要
申请公布号	US2152886(A)	申请公布日期	1939.04.04
申请号	US19370126216	申请日期	1937.02.17
申请人	HOSMER FRANK F	发明人	HOSMER FRANK F.
分类号	B62M11/14	主分类号	B62M11/14
代理机构		代理人
主权项
地址

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