![Casio fx 31. Dad bought this during his college days in 1978. Running flawlessly since 41 years now. I use it sometimes when I'm bored of using my phone. : r/BuyItForLife Casio fx 31. Dad bought this during his college days in 1978. Running flawlessly since 41 years now. I use it sometimes when I'm bored of using my phone. : r/BuyItForLife](https://preview.redd.it/rsyij284u5541.jpg?auto=webp&s=c7927051f3854afd023b756f9e4cab3215562761)
Casio fx 31. Dad bought this during his college days in 1978. Running flawlessly since 41 years now. I use it sometimes when I'm bored of using my phone. : r/BuyItForLife
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Casio - fx-31 - - Vintage calculator - Casio fx31 - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA
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Amazon.com : Casio fx-300ESPLUS2 2nd Edition, Standard Scientific Calculator, Black : Office Products
![VINTAGE Casio FX-31 Scientific Calculator 1978 JAPAN- Taschenrechner, € 39,- (1040 Wien) - willhaben VINTAGE Casio FX-31 Scientific Calculator 1978 JAPAN- Taschenrechner, € 39,- (1040 Wien) - willhaben](https://cache.willhaben.at/mmo/1/602/600/381_-342570211.jpg)