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发明名称
Mining machine of the boring type having two boring heads
摘要
申请公布号
US2818242(A)
申请公布日期
1957.12.31
申请号
US19560557398
申请日期
1956.01.04
申请人
GOODMAN MANUFACTURING COMPANY
发明人
SMITH HERMAN E.
分类号
E21C27/22
主分类号
E21C27/22
代理机构
代理人
主权项
地址
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