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发明名称
Roller bit
摘要
申请公布号
US2032575(A)
申请公布日期
1936.03.03
申请号
US19330666104
申请日期
1933.04.14
申请人
REED ROLLER BIT COMPANY
发明人
HARRINGTON GEORGE G.
分类号
E21B10/16
主分类号
E21B10/16
代理机构
代理人
主权项
地址
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