Which groundbreaking calculator product launch in 1972 was marketed as the first handheld scientific calculator and featured unique packaging with a professor's signature embossed on the cover?

In the world of mathematics education and professional tools, calculator launches have marked significant milestones in how we approach complex calculations. From basic arithmetic to advanced calculus, these devices have transformed mathematical work across industries and classrooms. This trivia question explores a pivotal moment in calculator history that revolutionized accessibility to advanced mathematics.

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HP-35 by Hewlett-Packard, signed by Professor William Hewlett
TI-2500 by Texas Instruments, signed by Professor Jack Kilby
Sinclair Scientific by Sinclair Radionics, signed by Professor Clive Sinclair
Busicom LE-120A by Busicom, signed by Professor Masatoshi Shima