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发明名称
Telephone-call tally apparatus
摘要
申请公布号
US2342348(A)
申请公布日期
1944.02.22
申请号
US19380196195
申请日期
1938.03.16
申请人
JOHNSON ERVIN G
发明人
JOHNSON ERVIN G.
分类号
H04M1/21
主分类号
H04M1/21
代理机构
代理人
主权项
地址
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