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发明名称
Anzeigevorrichtung zum Messen der Senkung des Hangenden und der Quellung des Liegenden
摘要
申请公布号
DE618774(C)
申请公布日期
1935.09.16
申请号
DENDATP068377D
申请日期
申请人
EMANUEL POHLS
发明人
分类号
E21F17/18
主分类号
E21F17/18
代理机构
代理人
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地址
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