What are the 4 ages of information technology?

 
The Four Ages Of Technology
 
The Premechanical Age. 3000 B.C.- 1450 A.D.
 
The Mechanical Age: 1450 – 1840.
 
The Electronic Age: 1940 – Present.
 
The Electromechanical Age: 1840 – 1940.
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