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发明名称
Perpetual calendar
摘要
申请公布号
EP0338294(B1)
申请公布日期
1996.09.25
申请号
EP19890105571
申请日期
1989.03.29
申请人
HOYECK, RALPH HABER
发明人
HOYECK, RALPH HABER
分类号
G09D3/08;G09D3/04;G09D3/10;G09F3/10;(IPC1-7):G09D3/04
主分类号
G09D3/08
代理机构
代理人
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地址
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