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发明名称
Rocker bearing for walking beams
摘要
申请公布号
US1825096(A)
申请公布日期
1931.09.29
申请号
US19290377549
申请日期
1929.07.11
申请人
THE PARKERSBURG RIG AND REEL COMPANY
发明人
SCHWEMLEIN WILLIAM
分类号
E21B1/04
主分类号
E21B1/04
代理机构
代理人
主权项
地址
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