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发明名称
Tone unit
摘要
申请公布号
US2482478(A)
申请公布日期
1949.09.20
申请号
US19470738194
申请日期
1947.03.29
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
GRANDSTAFF OTHO D.
分类号
H04M3/62
主分类号
H04M3/62
代理机构
代理人
主权项
地址
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