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经营范围
发明名称
Means for protecting bearings of roller bits
摘要
申请公布号
US2329745(A)
申请公布日期
1943.09.21
申请号
US19400361240
申请日期
1940.10.15
申请人
REED ROLLER BIT COMPANY
发明人
CROOK WILLIAM M.
分类号
E21B10/23;E21B10/24;E21B21/00
主分类号
E21B10/23
代理机构
代理人
主权项
地址
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