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发明名称
Metallener Grubenstempel mit einem Rohrstueck, welches mit einem Ende teleskopartig eine Saeule umfasst, die durch ein zusammenschiebbares Lager abgestuetzt ist
摘要
申请公布号
DE491307(C)
申请公布日期
1930.03.01
申请号
DE1928W081366D
申请日期
1928.12.29
申请人
JOHN WILSON
发明人
分类号
E21D15/10
主分类号
E21D15/10
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