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发明名称
Improvements in and relating to swabs for use in oil and like wells
摘要
申请公布号
GB608149(A)
申请公布日期
1948.09.10
申请号
GB19460003497
申请日期
1946.02.04
申请人
FRANK WALMSLEY;ENGLISH DRILLING EQUIPMENT COMPANY LIMITED
发明人
分类号
E21B37/10
主分类号
E21B37/10
代理机构
代理人
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