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发明名称
Perpetual calendar
摘要
申请公布号
US2170408(A)
申请公布日期
1939.08.22
申请号
US19370152080
申请日期
1937.07.06
申请人
HILLCOURT CARROL W
发明人
HILLCOURT CARROL W.
分类号
G04B19/257
主分类号
G04B19/257
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代理人
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