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发明名称
Apparatus for mining submerged precious metals
摘要
申请公布号
US2144743(A)
申请公布日期
1939.01.24
申请号
US19350047163
申请日期
1935.10.28
申请人
SCHULZ GUSTAV O
发明人
SCHULZ GUSTAV O.
分类号
E21C45/00
主分类号
E21C45/00
代理机构
代理人
主权项
地址
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