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发明名称
Telephone system
摘要
申请公布号
US2179652(A)
申请公布日期
1939.11.14
申请号
US19380183744
申请日期
1938.01.07
申请人
DICTOGRAPH PRODUCTS COMPANY, INC.
发明人
WAITE WILLIAM H.
分类号
H04M9/00
主分类号
H04M9/00
代理机构
代理人
主权项
地址
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