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发明名称
Schallverstärkungshorn und Verfahren zu seiner Herstellung.
摘要
申请公布号
AT119173(B)
申请公布日期
1930.09.25
申请号
ATD119173
申请日期
1928.07.19
申请人
TEMPLE INC.
发明人
分类号
主分类号
代理机构
代理人
主权项
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