What did the introduction of the Busicom LE-120A 'Handy' in 1971 signify?

Answer

The definitive end of the purely mechanical calculating age

The advent of compact, handheld electronic calculators, demonstrated by models like the Handy, marked the obsolescence of gear-driven mechanical devices.

What did the introduction of the Busicom LE-120A 'Handy' in 1971 signify?

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