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发明名称
PACKER SEAL MEANS AND METHOD
摘要
申请公布号
GB8915934(D0)
申请公布日期
1989.08.31
申请号
GB19890015934
申请日期
1989.07.12
申请人
OTIS ENGINEERING CORPORATION
发明人
分类号
E21B33/12;E21B33/122
主分类号
E21B33/12
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代理人
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