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经营范围
发明名称
Ram with laminated plates
摘要
申请公布号
US2194258(A)
申请公布日期
1940.03.19
申请号
US19370181830
申请日期
1937.12.27
申请人
CAMERON IRON WORKS
发明人
ALLEN HERBERT
分类号
E21B33/06
主分类号
E21B33/06
代理机构
代理人
主权项
地址
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