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lesson 2 Stages of technology development over time 1) Pre - Mechanical Revolution From 3000 BC to 1450 AD People communicate in this era (ink pens and pencils - papers - manuscripts - digital counter) 2) the era of the mechanical revolution from 1450 AD to 1840 AD in this era the typewriter appeared. first version of the calculator , Pascaline machine 3) The era of the electromechanical revolution from 1840 AD to 1940 AD Telephone, Recording Device and First Digital Computer 4) The era of the electronic revolution from 1940 AD until now : Location objects such as (satellite - GPS - online maps) Communicating people (Using email - Text messages) software ( word processing writing on the computer