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经营范围
发明名称
Roof bolt extractor machine
摘要
申请公布号
US2872835(A)
申请公布日期
1959.02.10
申请号
US19570676584
申请日期
1957.08.06
申请人
TALKINGTON HARRY W
发明人
TALKINGTON HARRY W.
分类号
E21D20/00
主分类号
E21D20/00
代理机构
代理人
主权项
地址
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