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发明名称
Multioffice telephone system
摘要
申请公布号
US1793448(A)
申请公布日期
1931.02.17
申请号
US19270185696
申请日期
1927.04.22
申请人
RESERVE HOLDING COMPANY
发明人
STEHLIK RUDOLPH FRANK
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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