![Paul Marks on X: "@zsk @jimeasterbrook Casio fx-29 calculator ... still working and eating all my pi since 1977. Fitted well in the knee pockets of high waisters - anyone remember those? Paul Marks on X: "@zsk @jimeasterbrook Casio fx-29 calculator ... still working and eating all my pi since 1977. Fitted well in the knee pockets of high waisters - anyone remember those?](https://pbs.twimg.com/media/EZ_e4MSXYAAON0m.jpg:large)
Paul Marks on X: "@zsk @jimeasterbrook Casio fx-29 calculator ... still working and eating all my pi since 1977. Fitted well in the knee pockets of high waisters - anyone remember those?
![RARE Casio FX-39 Scientific Calculator Green VFD Display 1970s Vintage Tested! | Scientific calculator, Calculator, Old technology RARE Casio FX-39 Scientific Calculator Green VFD Display 1970s Vintage Tested! | Scientific calculator, Calculator, Old technology](https://i.pinimg.com/736x/31/0a/48/310a48b3978629523ff0c417a538dc7c.jpg)
RARE Casio FX-39 Scientific Calculator Green VFD Display 1970s Vintage Tested! | Scientific calculator, Calculator, Old technology
![Casio - fx-39 - - Vintage calculator - Casio fx39 - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA Casio - fx-39 - - Vintage calculator - Casio fx39 - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA](https://casio.ledudu.com/images/calculs/casio/machines/zoom/fx39.jpg)
Casio - fx-39 - - Vintage calculator - Casio fx39 - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA
![CASIO fx-39 8桁 関数電卓[カシオ][計算機][昭和レトロ][当時物]27M(カシオ)|売買されたオークション情報、ヤフオク! の商品情報をアーカイブ公開 - オークファン(aucfan.com) CASIO fx-39 8桁 関数電卓[カシオ][計算機][昭和レトロ][当時物]27M(カシオ)|売買されたオークション情報、ヤフオク! の商品情報をアーカイブ公開 - オークファン(aucfan.com)](https://auctions.c.yimg.jp/images.auctions.yahoo.co.jp/image/dr000/auc0409/users/4c193abfcd427e057e6e6a0942f3c782171949ac/i-img1200x800-1694887070tqfpks133732.jpg)