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发明名称
摘要
申请公布号
NL6903909(A)
申请公布日期
1969.09.17
申请号
NL19690003909
申请日期
1969.03.13
申请人
发明人
分类号
E02B11/02;E02F5/10;F16L1/032;(IPC1-7):F16L1/00
主分类号
E02B11/02
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