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发明名称
摘要
申请公布号
DE1772937(A1)
申请公布日期
1972.03.23
申请号
DE19681772937
申请日期
1968.07.24
申请人
发明人
分类号
G03B17/52;(IPC1-7):G03B17/52
主分类号
G03B17/52
代理机构
代理人
主权项
地址
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