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发明名称
Total key unlocking means for adding machines
摘要
申请公布号
US1935609(A)
申请公布日期
1933.11.21
申请号
US19310545070
申请日期
1931.06.17
申请人
PORTABLE ADDING MACHINE COMPANY
发明人
BARRETT GLENN J.
分类号
G06C21/04
主分类号
G06C21/04
代理机构
代理人
主权项
地址
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