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Class Information
Number: 434/312
Name: Education and demonstration > Audio recording and visual means > Common carrier for visual means and audio recording > Card, sheet, or block > Reading head moved past stationary audio track
Description: Subject matter wherein the sound information is reproduced by moving a reproducing head past an audio track on a stationary card, sheet, or block.










Sub-classes under this class:

Class Number Class Name Patents
434/313 Manually 5


Patents under this class:

Patent Number Title Of Patent Date Issued
6482564 Electronically active primer layers for thermal patterning of materials for electronic devices Nov. 19, 2002
4460342 Aid for speech therapy and a method of making same Jul. 17, 1984
4273538 Educational aid Jun. 16, 1981
4245404 Audio-visual teaching machine Jan. 20, 1981
4027405 Record-reproduce device for flash cards Jun. 7, 1977











 
 
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