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发明名称
Acoustical horn
摘要
申请公布号
US1767812(A)
申请公布日期
1930.06.24
申请号
US19280287053
申请日期
1928.06.21
申请人
JOHNSON LABORATORIES, INC.
发明人
POLYDOROFF WLADIMIR J.
分类号
H04R1/30
主分类号
H04R1/30
代理机构
代理人
主权项
地址
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