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发明名称
Self-changing perpetual-calendar
摘要
申请公布号
GB9803644(D0)
申请公布日期
1998.04.15
申请号
GB19980003644
申请日期
1998.02.23
申请人
DUNNING, GEORGE E
发明人
分类号
G04C17/00;G09D3/12
主分类号
G04C17/00
代理机构
代理人
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