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发明名称
Typewriter attachment
摘要
申请公布号
US1814142(A)
申请公布日期
1931.07.14
申请号
US19280261477
申请日期
1928.03.14
申请人
MODERN UTILITIES COMPANY
发明人
FRANTZ GROVER C.
分类号
B41J15/02
主分类号
B41J15/02
代理机构
代理人
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