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发明名称
Telephone card holder
摘要
申请公布号
US1837217(A)
申请公布日期
1931.12.22
申请号
US19290330559
申请日期
1929.01.05
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HAYWARD JOHN M.
分类号
G09F3/18
主分类号
G09F3/18
代理机构
代理人
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