Which groundbreaking invention, first commercialized in 1971, contained thousands of transistors on a single chip and revolutionized the computing industry?

In the world of technological inventions, some innovations fundamentally transform industries and reshape society. The development of microprocessors represented one such pivotal moment in computing history, launching the era of personal computers and eventually smartphones. This poll tests your knowledge about a key moment in the evolution of computer technology that made portable computing possible.

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Intel 4004 microprocessor
IBM System/360 mainframe
Fairchild Semiconductor integrated circuit
Texas Instruments calculator chip