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发明名称
摘要
申请公布号	DE1417989(U)	申请公布日期	1937.10.14
申请号	DE1936A021131U	申请日期	1936.12.17
申请人		发明人
分类号	G04B31/016	主分类号	G04B31/016
代理机构		代理人
主权项
地址

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