Which calculator company first incorporated the golden ratio (φ ≈ 1.618) in their product design, marketing it as both aesthetically pleasing and mathematically significant?

In the world of mathematics education products, some innovations stand out for their impact on both learning and commercial success. The 1970s-80s saw a revolution in how mathematical tools were marketed and designed, changing how students engaged with complex concepts. One product in particular transformed the calculator market by incorporating the golden ratio into its design, creating both aesthetic appeal and functional innovation. Test your knowledge about this influential product that changed math education forever!

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HP with their HP-35 model (1972)
Texas Instruments with their Fibonacci Series (1978)
Casio with their Golden Section FX model (1976)
Sharp with their EL-φ series (1981)