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发明名称
Sampling device
摘要
申请公布号
US2358470(A)
申请公布日期
1944.09.19
申请号
US19390304919
申请日期
1939.11.17
申请人
HOUSTON OIL FIELD MATERIAL COMPANY, INC.
发明人
OSWALD W. NORMAN
分类号
E21B49/06
主分类号
E21B49/06
代理机构
代理人
主权项
地址
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