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经营范围
发明名称
Electroacoustic transducer
摘要
申请公布号
US2416314(A)
申请公布日期
1947.02.25
申请号
US19390309992
申请日期
1939.12.19
申请人
SUBMARINE SIGNAL COMPANY
发明人
HARRISON BERTRAM M.
分类号
B06B1/06
主分类号
B06B1/06
代理机构
代理人
主权项
地址
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