How many industrial revolutions are we said to have experienced so far as in human history?

Question

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We have experienced four industrial revolutions in human history. The first industrial revolution began in the late 18th century with the introduction of mechanical production and steam power. The second industrial revolution occurred in the late 19th century with the widespread adoption of electricity and assembly line production. The third industrial revolution took place in the late 20th century with the onset of computerization and automation. The fourth industrial revolution is happening now, marked by the merging of digital, physical, and biological technologies.

How Many Industrial Revolutions Are We Said to Have Experienced