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发明名称
Perpetual calendar
摘要
申请公布号
US1907261(A)
申请公布日期
1933.05.02
申请号
US19320617885
申请日期
1932.06.17
申请人
FRANKLIN SHEDD HUGH
发明人
SHEDD HUGH FRANKLIN
分类号
G09D3/04
主分类号
G09D3/04
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