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发明名称
Perpetual calendar
摘要
申请公布号
US3242602(A)
申请公布日期
1966.03.29
申请号
US19630274480
申请日期
1963.04.22
申请人
STERN ROBERT K;STERN MAURICE N
发明人
STERN ROBERT K.;STERN MAURICE N.
分类号
G09D3/06
主分类号
G09D3/06
代理机构
代理人
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