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发明名称
Recording device for telephone sets
摘要
申请公布号
US2130336(A)
申请公布日期
1938.09.20
申请号
US19360114299
申请日期
1936.12.05
申请人
FRIEDRICH BONN
发明人
BONN FRIEDRICH
分类号
H04M1/274;H04M1/56
主分类号
H04M1/274
代理机构
代理人
主权项
地址
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