Their are four (4) basic periods


1. Pre-Mechanical age: 3000 B.C - 1450 A.D

2. Mechanical age: 1450 - 1840

3. Electro mechanical age: 1840 - 1940

4. Electronic age: 1941 - present

PRE - MECHANICAL AGE: 3000 B.C - 1450 A.D

Mechanhcal Age: 1450-1840

Electro Mechanical Age: 1840- 1940
ELECTRONIC AGE: 1941 - Present