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发明名称
RATIO METER
摘要
申请公布号
CA423644(A)
申请公布日期
1944.11.07
申请号
CAD423644
申请日期
申请人
CLEVELAND PATENTS
发明人
ROBERT D. HICKOK
分类号
主分类号
代理机构
代理人
主权项
地址
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