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发明名称
Drilling apparatus
摘要
申请公布号
US3068725(A)
申请公布日期
1962.12.18
申请号
US19600062505
申请日期
1960.10.13
申请人
T. D. WILLIAMSON, INC.
发明人
NOOY BURTON VER
分类号
B23B41/08;F16L41/04
主分类号
B23B41/08
代理机构
代理人
主权项
地址
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