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发明名称
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摘要
申请公布号
GB1483300(A)
申请公布日期
1977.08.17
申请号
GB19750052306
申请日期
1975.12.22
申请人
RITZERFELD G
发明人
分类号
G03B21/132;G03B21/20;(IPC1-7):G03B21/14;G03B21/13;G03B21/28
主分类号
G03B21/132
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