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发明名称
KOMBINIERTES FERNSPRECH- UND SIGNALGERAET FUER FOERDERSCHAECHTE, INSBESONDERE HAUPT- UND BLINDSCHAECHTE.
摘要
申请公布号
DE1692374(U)
申请公布日期
1955.02.03
申请号
DE195400F8215U
申请日期
1954.09.14
申请人
FERNSPRECH- UND SIGNALBAU LEHNER & CO. K.G.
发明人
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主分类号
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