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发明名称
Explosion-proof acoustic device
摘要
申请公布号
US2655566(A)
申请公布日期
1953.10.13
申请号
US19490091207
申请日期
1949.05.03
申请人
PITTINGER ABRAHAM L
发明人
PITTINGER ABRAHAM L.
分类号
H04R9/06
主分类号
H04R9/06
代理机构
代理人
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