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File:Vintage Magic Brain Mechanical Pocket Calculator, Made in Japan (11591234036).jpg - Wikimedia Commons

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KINGSON POCKET CALCULATOR VINTAGE/RETRO WITH MANUAL Pen + CASE 1960 £19.99 - PicClick UK

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KINGSON POCKET CALCULATOR VINTAGE/RETRO WITH MANUAL Pen + CASE 1960 £19.99 - PicClick UK

VINTAGE KINGSON MAGIC brain pocket calculator with stylus Hong Kong £17.11 - PicClick UK