Which mathematical instrument first achieved widespread commercial success in the early 1970s, becoming a required school supply due to a revolutionary marketing strategy that positioned it as essential for modern math education?

Throughout history, mathematical tools have evolved from specialized instruments to everyday classroom essentials. The commercialization and mass production of these tools transformed how mathematics is taught and practiced. This poll explores a significant market trend that revolutionized access to mathematical education tools and helped standardize math instruction across schools worldwide.

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The scientific calculator (particularly Texas Instruments' models)
The mechanical pencil with precision lead sizes
The geometry set in metal tins
The color-coded algebra manipulatives kit