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发明名称
Clock
摘要
申请公布号
US1891281(A)
申请公布日期
1932.12.20
申请号
US19290362392
申请日期
1929.05.11
申请人
JOHNSON WILLIAM D
发明人
JOHNSON WILLIAM D.
分类号
G04B23/02
主分类号
G04B23/02
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