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发明名称
Obturating device
摘要
申请公布号
GB2233894(A)
申请公布日期
1991.01.23
申请号
GB19890016424
申请日期
1989.07.18
申请人
* BREC BUILDERS LIMITED
发明人
KEITH JAMES * KNOWLTON
分类号
E03C1/23
主分类号
E03C1/23
代理机构
代理人
主权项
地址
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