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发明名称
Counterbalance
摘要
申请公布号
US2198348(A)
申请公布日期
1940.04.23
申请号
US19380200392
申请日期
1938.04.06
申请人
J. F. DARBY
发明人
PORTER ALBERT N.
分类号
F16F15/28
主分类号
F16F15/28
代理机构
代理人
主权项
地址
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