Which of these mathematical calculation tools was first introduced by Hewlett-Packard in 1972 and became the first scientific pocket calculator to use RPN (Reverse Polish Notation)?

Throughout history, mathematical tools have evolved from simple counting devices to sophisticated calculating instruments and eventually digital technology. These innovations have transformed how we teach, learn, and practice mathematics. This trivia question explores a famous mathematical product that revolutionized education and professional calculation in the mid-20th century.

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HP-35
TI-30
Casio fx-7000G
Sharp EL-500