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发明名称
Akustische Vorrichtung.
摘要
申请公布号
AT150218(B)
申请公布日期
1937.07.26
申请号
ATD150218
申请日期
1935.12.28
申请人
VEREINIGTE TELEPHON- UND TELEGRAPHENFABRIKS-AKTIEN-GESELLSCHAFT CZEIJA, NISSL & CO.
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