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发明名称
Perfectionnements aux postes téléphoniques à microphone et à récepteur distants de l'usager
摘要
申请公布号
FR810205(A)
申请公布日期
1937.03.18
申请号
FRD810205
申请日期
1936.09.01
申请人
发明人
SCHMIDT HANS CLEMENS
分类号
H04M1/60
主分类号
H04M1/60
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代理人
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