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发明名称
Calculating apparatus
摘要
申请公布号
US1851744(A)
申请公布日期
1932.03.29
申请号
US19280320130
申请日期
1928.11.17
申请人
WELLINGTON BARRETT R
发明人
WELLINGTON BARRETT R.
分类号
G06G1/14
主分类号
G06G1/14
代理机构
代理人
主权项
地址
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