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经营范围
发明名称
Vertical shaft excavating apparatus
摘要
申请公布号
US2474803(A)
申请公布日期
1949.06.28
申请号
US19470747217
申请日期
1947.05.10
申请人
PUTNAM ALVIN A
发明人
PUTNAM ALVIN A.
分类号
E21D1/03
主分类号
E21D1/03
代理机构
代理人
主权项
地址
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