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发明名称
Telephone receiver
摘要
申请公布号
US1854812(A)
申请公布日期
1932.04.19
申请号
US19300505825
申请日期
1930.12.31
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
STEINBERG JOHN C.
分类号
G01H3/00
主分类号
G01H3/00
代理机构
代理人
主权项
地址
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