Which innovative calculating device, first introduced in 1972, revolutionized mathematics education and was marketed with the slogan 'A calculating marvel that fits in your pocket'?

Throughout history, calculating tools have evolved dramatically, from ancient devices to modern computing. Many brands and products have played crucial roles in mathematical education and professional computation. This poll tests your knowledge about a significant product innovation that revolutionized mathematics education and engineering calculations in the mid-20th century.

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• Texas Instruments TI-2500 'Datamath'
• Hewlett-Packard HP-35
• Casio Mini CM-602
• Busicom LE-120A 'HANDY'

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