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经营范围
发明名称
Telephone calling dial
摘要
申请公布号
US2469974(A)
申请公布日期
1949.05.10
申请号
US19470726256
申请日期
1947.02.04
申请人
WESTERN ELECTRIC COMPANY, INCORPORATED
发明人
MCCAIN CECIL C.
分类号
H04M1/31
主分类号
H04M1/31
代理机构
代理人
主权项
地址
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