Which calculator company was the first to introduce the now-standard algebraic operating system (allowing equations to be entered as written) to consumer calculators in 1977?

The tools we use for mathematics education and calculation have evolved significantly over centuries. Behind many of these innovations are companies with fascinating histories. This poll explores the brand history of mathematical tools that have shaped how we learn and practice mathematics. Test your knowledge of these influential companies that have been instrumental in mathematical education and calculation technology!

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Casio with the fx-10 model
Texas Instruments with the TI-59 model
Hewlett-Packard with the HP-25 model
Sharp with the EL-5100 model