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Diaries
Initial settings after RESET, Keep written copies of important data., Important Precautions | Casio SF-3990 | User Guide (Page 6)
Casio - SF-3990GY-w - - Digital Diary - Casio SF3990GYw - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA
Casio - SF-3990WE-w - - Digital Diary - Casio SF3990WEw - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA
Casio Digital Diary SF-3990 still working : r/casio
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