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Amazon.com : Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural : Office Products
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it's very useful when you need to calculate something ;) Web 2.0 scientific calc… | Scientific calculator, Math expressions, Math questions
![Amazon.com : Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural : Office Products Amazon.com : Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural : Office Products](https://images-na.ssl-images-amazon.com/images/I/71e6EfW23DL._AC_UL210_SR210,210_.jpg)
Amazon.com : Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural : Office Products
![File:Vintage Casio Model fx-19 Pocket LED Scientific Calculator, Made in Japan, Circa 1976 (9301980665).jpg - Wikimedia Commons File:Vintage Casio Model fx-19 Pocket LED Scientific Calculator, Made in Japan, Circa 1976 (9301980665).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/2/25/Vintage_Casio_Model_fx-19_Pocket_LED_Scientific_Calculator%2C_Made_in_Japan%2C_Circa_1976_%289301980665%29.jpg/1200px-Vintage_Casio_Model_fx-19_Pocket_LED_Scientific_Calculator%2C_Made_in_Japan%2C_Circa_1976_%289301980665%29.jpg)
File:Vintage Casio Model fx-19 Pocket LED Scientific Calculator, Made in Japan, Circa 1976 (9301980665).jpg - Wikimedia Commons
![Amazon.com : Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural : Office Products Amazon.com : Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural : Office Products](https://m.media-amazon.com/images/I/71e6EfW23DL._AC_UF894,1000_QL80_.jpg)