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经营范围
发明名称
Protractor
摘要
申请公布号
US1975400(A)
申请公布日期
1934.10.02
申请号
US19330666730
申请日期
1933.04.18
申请人
HENRY MAYFIELD
发明人
MAYFIELD HENRY
分类号
G01C1/00
主分类号
G01C1/00
代理机构
代理人
主权项
地址
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