| 摘要 |
<p>An audio-visual cartridge comprising: a flat envelope having spaced opposing walls joined at edges; means forming flat first and second internal compartments between said opposing walls; first and second planar information carrying discs arranged in coplanar relation within said compartments; said first disc being freely rotatable within said first compartment and carrying a plurality of picture transparencies mounted in a ring for successive viewing on rotation of said first disc; and said second disc being freely rotatable within said second compartment and having sound-recording tracks on a face thereof for reproduction of recorded sound on rotation of said second disc.</p> |
