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发明名称
Method of manufacturing transmitter carbon
摘要
申请公布号
US1907843(A)
申请公布日期
1933.05.09
申请号
US19300434990
申请日期
1930.03.11
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
LOWRY HOMER H.
分类号
H04R21/00
主分类号
H04R21/00
代理机构
代理人
主权项
地址
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