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发明名称
EINRICHTUNG ZUR AUFZEICHNUNG UND WIEDERGABE MECHANISCHER SCHALLSCHRIFT.
摘要
申请公布号
DE1622721(U)
申请公布日期
1951.05.02
申请号
DE194900D1008U
申请日期
1949.06.29
申请人
SIEMENS & HALSKE A.G.
发明人
分类号
主分类号
代理机构
代理人
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