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发明名称
摘要
申请公布号
GB1234259(A)
申请公布日期
1971.06.03
申请号
GBD1234259
申请日期
1968.11.20
申请人
发明人
分类号
G03B7/26;G03B19/18
主分类号
G03B7/26
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