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发明名称
Sonometer
摘要
申请公布号
US2199120(A)
申请公布日期
1940.04.30
申请号
US19380241570
申请日期
1938.11.21
申请人
ULRICH CARL J
发明人
ULRICH CARL J.
分类号
G09B23/06;G10G7/02
主分类号
G09B23/06
代理机构
代理人
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地址
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