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摘要
申请公布号
US2177938(A)
申请公布日期
1939.10.31
申请号
US19370121936
申请日期
1937.01.23
申请人
ALVIN HAMILTON VAN
发明人
HAMILTON VAN ALVIN
分类号
A63B71/06;G09F9/307
主分类号
A63B71/06
代理机构
代理人
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