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发明名称
摘要
申请公布号
NL6918913(A)
申请公布日期
1970.08.04
申请号
NL19690018913
申请日期
1969.12.17
申请人
发明人
分类号
E04D13/04;(IPC1-7):E04D13/04
主分类号
E04D13/04
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代理人
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地址
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