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摘要
申请公布号
US1874202(A)
申请公布日期
1932.08.30
申请号
US19310546315
申请日期
1931.06.23
申请人
MICHELSEN THOR J
发明人
MICHELSEN THOR J.
分类号
G09F11/26
主分类号
G09F11/26
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