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发明名称
摘要
申请公布号
BE676987(A)
申请公布日期
1966.07.18
申请号
BED676987
申请日期
1966.02.24
申请人
发明人
分类号
C01B31/00;C04B35/52;C04B41/50;C04B41/85
主分类号
C01B31/00
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代理人
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