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发明名称
Telephone system
摘要
申请公布号
US1801931(A)
申请公布日期
1931.04.21
申请号
US19280321801
申请日期
1928.11.26
申请人
RESERVE HOLDING COMPANY
发明人
LUNDQUIST FRANK A.
分类号
H01H67/12
主分类号
H01H67/12
代理机构
代理人
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