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发明名称
Mechanical calendar
摘要
申请公布号
US2775092(A)
申请公布日期
1956.12.25
申请号
US19520300726
申请日期
1952.07.24
申请人
HOWARD FRANK A
发明人
HOWARD FRANK A.
分类号
G04C17/00
主分类号
G04C17/00
代理机构
代理人
主权项
地址
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