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发明名称
EDUCATIONAL TELEVISION SYSTEM
摘要
申请公布号
US3546791(A)
申请公布日期
1970.12.15
申请号
USD3546791
申请日期
1968.06.20
申请人
EUGENIA M. KOOS
发明人
EUGENIA M. KOOS;JOSEPH B. BALAZS
分类号
G09B7/06;H04N7/173;(IPC1-7):G09B7/06
主分类号
G09B7/06
代理机构
代理人
主权项
地址
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