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经营范围
发明名称
SPEECH TRAINING AID
摘要
申请公布号
US3626607(A)
申请公布日期
1971.12.14
申请号
USD3626607
申请日期
1970.02.24
申请人
WILLIAM O. SCHWAKE
发明人
WILLIAM O. SCHWAKE
分类号
G09B21/00;(IPC1-7):G09B21/00
主分类号
G09B21/00
代理机构
代理人
主权项
地址
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