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发明名称
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摘要
申请公布号
US2939420(A)
申请公布日期
1960.06.07
申请号
US19590799153
申请日期
1959.03.13
申请人
THOMAS HEWITT
发明人
HEWITT THOMAS
分类号
G04B19/28
主分类号
G04B19/28
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