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经营范围
发明名称
Electronically sounding blackboard
摘要
申请公布号
US3382750(A)
申请公布日期
1968.05.14
申请号
US19660567958
申请日期
1966.07.26
申请人
MITSUNAGA HIYAMA
发明人
HIYAMA MITSUNAGA
分类号
G09B15/04
主分类号
G09B15/04
代理机构
代理人
主权项
地址
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