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发明名称
Perpetual calendar
摘要
申请公布号
US2757467(A)
申请公布日期
1956.08.07
申请号
US19540425801
申请日期
1954.04.27
申请人
PARK SHERMAN CO.
发明人
GORDON HOWARD R.
分类号
G09D3/06
主分类号
G09D3/06
代理机构
代理人
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