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发明名称
Bearing for drill stems
摘要
申请公布号
US1788630(A)
申请公布日期
1931.01.13
申请号
US19270212907
申请日期
1927.08.15
申请人
JOHN GRANT
发明人
GRANT JOHN
分类号
F16C19/22
主分类号
F16C19/22
代理机构
代理人
主权项
地址
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