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发明名称
Coal auger bit
摘要
申请公布号
US1955768(A)
申请公布日期
1934.04.24
申请号
US19320647777
申请日期
1932.12.17
申请人
WILLIAM E. MCDERMOTT;MCDERMOTT;VESTOR J. SKUTT
发明人
POWELL WILLIAM E.
分类号
E21B10/44
主分类号
E21B10/44
代理机构
代理人
主权项
地址
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