check out the keys on this old calculator, especially that zigzag "+" key
source
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Little Twin Stars calculator 😭💕
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Little Twin Stars calculator.
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Olivetti Divisumma 18 // Portable calculator with printer (1972)
Rubber membrane keyboard. Design by Mario Bellini.
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Educational Insights Digitor Skillmaster // Math Teaching Tool (US, 1985)
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(via AisleOne (@AisleOne) / Twitter)
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ElectriCalc Pro Electrical Code Calculator
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Input keyboard for the IME KB-6 calculator (Italy, 1973)
via
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TI-77 Plus graphing calculator
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