Which calculator product's marketing campaign famously challenged users to 'race' against it, demonstrating its unprecedented calculation speed in the 1970s?

The handheld calculator transformed mathematics education and professional computation in the 1970s, sparking intense competition among manufacturers. Different companies employed various marketing strategies and product innovations to capture market share in this rapidly evolving space. This poll tests your knowledge about one of the most significant product marketing campaigns in the history of mathematical tools.

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Texas Instruments TI-30
Hewlett-Packard HP-35
Casio fx-7000G
Sinclair Cambridge