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发明名称
Mathematical instrument
摘要
申请公布号
US2996803(A)
申请公布日期
1961.08.22
申请号
US19580770950
申请日期
1958.10.31
申请人
FRED SALTZ;LOMBARD JR HENRY J
发明人
SALTZ FRED;JR. HENRY J. LOMBARD,
分类号
B43L13/00
主分类号
B43L13/00
代理机构
代理人
主权项
地址
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