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发明名称
Drift indicator
摘要
申请公布号
US3176407(A)
申请公布日期
1965.04.06
申请号
US19600014311
申请日期
1960.03.11
申请人
VARNEY ENGINEERING CORPORATION
发明人
ALDER ROBERT LEE;AMERICH PAUL J.
分类号
E21B47/022
主分类号
E21B47/022
代理机构
代理人
主权项
地址
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