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发明名称
Composite back-up ring structure
摘要
申请公布号
US3158378(A)
申请公布日期
1964.11.24
申请号
US19620170538
申请日期
1962.02.02
申请人
LOOMIS GLENN L
发明人
LOOMIS GLENN L.
分类号
E21B33/12;F16J13/00
主分类号
E21B33/12
代理机构
代理人
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地址
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