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发明名称
Spelling devices
摘要
申请公布号
US3146534(A)
申请公布日期
1964.09.01
申请号
US19620190993
申请日期
1962.04.30
申请人
BROWN RAYMOND E;CRUGNALE THOMAS A
发明人
BROWN RAYMOND E.;CRUGNALE THOMAS A.
分类号
G09B17/00
主分类号
G09B17/00
代理机构
代理人
主权项
地址
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