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发明名称
摘要
申请公布号
DD95121(A1)
申请公布日期
1973.01.12
申请号
DD19710159525
申请日期
1971.12.13
申请人
发明人
分类号
G02B21/26;(IPC1-7):G02B21/26
主分类号
G02B21/26
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代理人
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地址
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