Which famous calculator brand successfully pivoted from slide rules to electronic calculators in the 1970s, maintaining its market leadership through this fundamental product innovation?

The world of mathematics has seen numerous companies develop specialized products for education and professional use. These brands have evolved over time, creating distinctive identities in the industry. This trivia question focuses on how one of the most recognized mathematical tool manufacturers transformed its product line and branding to adapt to technological changes while maintaining its heritage in mathematical precision.

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Texas Instruments
Keuffel & Esser (K&E)
Casio
Hewlett-Packard