Which of these mathematical products was first patented in 1958, became a classroom staple by the 1960s, and revolutionized math education with its portable slide rule functionality?

Before digital calculators and computers, mathematical education and problem-solving relied on various innovative tools. These products revolutionized how mathematics was taught, learned, and applied in everyday situations. This trivia question focuses on a groundbreaking mathematical product that transformed education and became a retail phenomenon. Test your knowledge about the history of mathematical tools and their impact on society!

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Cuisenaire Rods (colored mathematical manipulatives)
Circular Slide Rule
Texas Instruments TI-30 Calculator
Slide Rule Watch (Circular slide rule integrated into wristwatches)