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发明名称
Keyboard clutch
摘要
申请公布号
US1987742(A)
申请公布日期
1935.01.15
申请号
US19310570623
申请日期
1931.10.23
申请人
WILLIAM J. PEARSON
发明人
LAWRENCE GEORGE W.
分类号
G01G23/18
主分类号
G01G23/18
代理机构
代理人
主权项
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