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发明名称
Dust counter
摘要
申请公布号
US2209614(A)
申请公布日期
1940.07.30
申请号
US19370145397
申请日期
1937.05.28
申请人
ROWLEY FRANK B
发明人
ROWLEY FRANK B.
分类号
G01N1/22;G01N15/06
主分类号
G01N1/22
代理机构
代理人
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地址
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