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发明名称
Wasserdichter Zwischenboden fuer Brunnenrohre
摘要
申请公布号
DE1459541(A1)
申请公布日期
1969.01.16
申请号
DE19631459541
申请日期
1963.10.28
申请人
RHEINISCHE BRAUNKOHLENWERKE AG;ETERNIT AG
发明人
分类号
E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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