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发明名称
Collapsible bit
摘要
申请公布号
US1819798(A)
申请公布日期
1931.08.18
申请号
US19270186473
申请日期
1927.04.25
申请人
REED ROLLER BIT COMPANY
发明人
STOKES JOHN C.
分类号
E21B10/32;E21B10/66
主分类号
E21B10/32
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代理人
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