Calcu-Pen the Electronic Calculator Pen: History and Demonstration « Adafruit Industries – Makers, hackers, artists, designers and engineers!
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Calcu-Pen the Electronic Calculator Pen: History and Demonstration « Adafruit Industries – Makers, hackers, artists, designers and engineers!
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The Calcupen
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Calcu-Pen the Electronic Calculator Pen: History and Demonstration « Adafruit Industries – Makers, hackers, artists, designers and engineers!
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Calcu-pen
