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发明名称
Am Bohrschwengel angeordneter selbsttaetiger Dreh- und Nachlassschluessel
摘要
申请公布号
DE697111(C)
申请公布日期
1940.10.07
申请号
DE193701W2412D
申请日期
1937.12.02
申请人
HEINRICH WOLTERS
发明人
WOLTERS HEINRICH
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
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