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经营范围
发明名称
Improvements in or relating to perpetual calendars
摘要
申请公布号
GB1022986(A)
申请公布日期
1966.03.16
申请号
GB19630036923
申请日期
1963.09.19
申请人
GEORGE ERNEST DUNNING
发明人
分类号
G09D3/12
主分类号
G09D3/12
代理机构
代理人
主权项
地址
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