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摘要
申请公布号
US1873841(A)
申请公布日期
1932.08.23
申请号
US19300493002
申请日期
1930.11.03
申请人
HUNT ALLAN F
发明人
HUNT ALLAN F.
分类号
G09B29/00
主分类号
G09B29/00
代理机构
代理人
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