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发明名称
Draftsman's and mechanic's instrument
摘要
申请公布号
US2595458(A)
申请公布日期
1952.05.06
申请号
US19490087025
申请日期
1949.04.12
申请人
GRAND SPECIALTIES COMPANY
发明人
HOPFELD FRED P.
分类号
G01B3/30
主分类号
G01B3/30
代理机构
代理人
主权项
地址
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