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发明名称
Focus drawing scale
摘要
申请公布号
US2350068(A)
申请公布日期
1944.05.30
申请号
US19430498752
申请日期
1943.08.16
申请人
HENRY SCHELLER
发明人
SCHELLER HENRY
分类号
B43L13/18
主分类号
B43L13/18
代理机构
代理人
主权项
地址
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