Which company first mass-produced the slide rule that became standard in mathematics education from the 1950s to the 1970s, before being replaced by electronic calculators?

Before modern computers and calculators, mathematicians relied on various tools and devices to perform calculations. These instruments shaped the development of mathematics education and how numerical concepts were taught in classrooms. This poll explores the corporate history of one such revolutionary mathematical tool that transformed how mathematics was taught and practiced in educational settings worldwide.

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Keuffel & Esser (K&E)
Texas Instruments
Faber-Castell
Pickett Industries