Improvement in secondary time-keeping apparatus,申请号GB19470007970-传众专利搜索

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发明名称	Improvement in secondary time-keeping apparatus
摘要
申请公布号	GB635572(A)	申请公布日期	1950.04.12
申请号	GB19470007970	申请日期	1947.03.24
申请人	INTERNATIONAL BUSINESS MACHINES CORPORATION	发明人
分类号	G04C13/10	主分类号	G04C13/10
代理机构		代理人
主权项
地址

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