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发明名称
ELECTRICAL APPARATUS
摘要
申请公布号
US3488970(A)
申请公布日期
1970.01.13
申请号
USD3488970
申请日期
1967.04.13
申请人
SCHLUMBERGER TECHNOLOGY CORP.
发明人
JAMES K. HALLENBURG
分类号
E21B36/00;E21B47/01;G01V13/00;(IPC1-7):F25B21/02;F25D23/12
主分类号
E21B36/00
代理机构
代理人
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地址
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