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发明名称
Shaft counterbalance
摘要
申请公布号
US2074792(A)
申请公布日期
1937.03.23
申请号
US19330704580
申请日期
1933.12.29
申请人
THE PARKERSBURG RIG & REEL COMPANY
发明人
LYNE JOE A.;MATER ROBERT GRIFFIN DE LA;COOPER JOHN M.
分类号
F04B47/14
主分类号
F04B47/14
代理机构
代理人
主权项
地址
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