发明名称 |
RECORDED AUDIO MEDIUM,IN PARTICULAR FOR INSTRUCTION PURPOSES |
摘要 |
A sound carrier is affixed where desired by the user onto a printed page of a book or the like and a sound reproducing unit is operatively engaged with the sound carrier by the user through the medium of visually locatable positioning means cooperatively carried by the sound carrier and the reproducing unit. |
申请公布号 |
ZA7100222(B) |
申请公布日期 |
1971.10.27 |
申请号 |
ZA19710000222 |
申请日期 |
1971.01.13 |
申请人 |
DOERING E |
发明人 |
DOERING E |
分类号 |
G11B5/74;B42D1/08;G09B5/06;G11B3/40;G11B17/025 |
主分类号 |
G11B5/74 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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