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发明名称
Apparatus for measuring optical densities
摘要
申请公布号
US1997712(A)
申请公布日期
1935.04.16
申请号
US19290406225
申请日期
1929.11.11
申请人
NORTH SHORE NEWS CO.
发明人
BAUER PAUL SHERMAN
分类号
G01J1/42
主分类号
G01J1/42
代理机构
代理人
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地址
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