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Continue to ChatiPen: Apple patent applications reveal advanced modular smart-pen https://macdailynews.com/2014/02/02/ipen-apple-patent-applications-reveal-advanced-modular-smart-pen/
iPen: Apple patent applications reveal advanced modular smart-pen https://macdailynews.com/2014/02/02/ipen-apple-patent-applications-reveal-advanced-modular-smart-pen/