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发明名称
Improvements in or relating to perpetual calendars
摘要
申请公布号
GB781613(A)
申请公布日期
1957.08.21
申请号
GB19550005462
申请日期
1955.02.23
申请人
LESLIE PETER SIMMONDS
发明人
分类号
G04C17/00;G04C21/20
主分类号
G04C17/00
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代理人
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