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发明名称
Protractor
摘要
申请公布号
US2412100(A)
申请公布日期
1946.12.03
申请号
US19440565697
申请日期
1944.11.29
申请人
SMITH NEIL C
发明人
SMITH NEIL C.
分类号
主分类号
代理机构
代理人
主权项
地址
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