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发明名称
APPARATUS FOR VISUAL MEASUREMENT OF CONCENTRATION OF SUSPENDED MATERIALS IN GASES
摘要
申请公布号
CA313492(A)
申请公布日期
1931.07.21
申请号
CAD313492
申请日期
申请人
THE INTERNATIONAL PRECIPITATION COMPANY
发明人
FLOYD H. VIETS
分类号
主分类号
代理机构
代理人
主权项
地址
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