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发明名称
摘要
申请公布号
SU553228(A1)
申请公布日期
1977.04.05
申请号
SU19752144873
申请日期
1975.06.17
申请人
发明人
分类号
C04B35/20;(IPC1-7):C04B35/20
主分类号
C04B35/20
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代理人
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地址
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