| Application number | Title of the application | Filing Date | Status |
|---|
| 07/104652 | DEVICE FOR STEREOPHONIC RECORDING OF SOUND EVENTS | Oct 1, 1987 | Abandoned |
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| 07/101567 | CONTROL CIRCUIT FOR CONTROLLING REPRODUCED TONE CHARACTERISTICS | Sep 27, 1987 | Abandoned |
| 07/101856 | INPUT LEVEL ADJUSTING CIRCUIT | Sep 27, 1987 | Abandoned |
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| 07/081754 | ANALOG VOLUME CONTROL CIRCUIT | Aug 4, 1987 | Abandoned |
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