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发明名称
Improvements in or relating to electric perpetual calendar
摘要
申请公布号
GB1113977(A)
申请公布日期
1968.05.15
申请号
GB19660016332
申请日期
1966.04.14
申请人
GEORGE ERNEST DUNNING
发明人
分类号
G04C17/00;G04G9/04
主分类号
G04C17/00
代理机构
代理人
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