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发明名称
CORE BARREL LATCH AND BY-PASS ASSEMBLY
摘要
申请公布号
CA754435(A)
申请公布日期
1967.03.14
申请号
CAD754435
申请日期
申请人
BOYLES BROS. DRILLING COMPANY LTD.
发明人
PERRY B. HALL;JAMES W. SMYTH
分类号
主分类号
代理机构
代理人
主权项
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