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发明名称
Typewriting machine
摘要
申请公布号
US2202451(A)
申请公布日期
1940.05.28
申请号
US19380247079
申请日期
1938.12.21
申请人
ROYAL TYPEWRITER COMPANY, INC.
发明人
HART HENRY JOSEPH
分类号
主分类号
代理机构
代理人
主权项
地址
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