Window of the "Robot mower tracking data calculator" software showing... | Download Scientific Diagram
![File:Vintage Sharp Electronic LCD Calculator, Model CT-550, Made in Japan, a Combination of a Clock, Stop Watch and Calculator in a Very Small Case, Circa 1977 (9330231960).jpg - Wikimedia Commons File:Vintage Sharp Electronic LCD Calculator, Model CT-550, Made in Japan, a Combination of a Clock, Stop Watch and Calculator in a Very Small Case, Circa 1977 (9330231960).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/1/1f/Vintage_Sharp_Electronic_LCD_Calculator%2C_Model_CT-550%2C_Made_in_Japan%2C_a_Combination_of_a_Clock%2C_Stop_Watch_and_Calculator_in_a_Very_Small_Case%2C_Circa_1977_%289330231960%29.jpg)
File:Vintage Sharp Electronic LCD Calculator, Model CT-550, Made in Japan, a Combination of a Clock, Stop Watch and Calculator in a Very Small Case, Circa 1977 (9330231960).jpg - Wikimedia Commons
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