The Canon Pocketronic is the first “handheld” battery-powered printing electronic calculator. The small solenoid that provides the 'kick' that advances the thermal paper.
The image was downloaded (2021-01-15) from: https://commons.wikimedia.org/wiki/File:Canon_Pocketronic_The_Solenoid.jpg
canon_pocketronic_the_solenoid.jpg
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Mister RF, CC-BY-SA-4.0