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发明名称
Means for indicating and/or recording unknown quantities
摘要
申请公布号
US2250712(A)
申请公布日期
1941.07.29
申请号
US19380218295
申请日期
1938.07.09
申请人
THE LEWIS ENGINEERING COMPANY
发明人
JOHNSON MANFRED J.
分类号
G01K7/02
主分类号
G01K7/02
代理机构
代理人
主权项
地址
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