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发明名称
Draft calculator
摘要
申请公布号
US2546641(A)
申请公布日期
1951.03.27
申请号
US19470758369
申请日期
1947.07.01
申请人
LLANSO FRANCISCO J
发明人
LLANSO FRANCISCO J.
分类号
G06G1/00
主分类号
G06G1/00
代理机构
代理人
主权项
地址
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