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发明名称
Circulating type straddle washer
摘要
申请公布号
US3391743(A)
申请公布日期
1968.07.09
申请号
US19670609410
申请日期
1967.01.16
申请人
J.W. BATEMAN
发明人
BATEMAN J. W.
分类号
E21B37/00;E21B47/10
主分类号
E21B37/00
代理机构
代理人
主权项
地址
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