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发明名称
摘要
申请公布号
GB1250351(A)
申请公布日期
1971.10.20
申请号
GBD1250351
申请日期
1968.11.14
申请人
发明人
分类号
F16L37/23;F16L37/32
主分类号
F16L37/23
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