Electromechanical era 1840 - 1940

The colossus machine 


The beginnings of comunication
voltaic batery 
radio
thelegraph
telephone



Mark 1 
The first complete turning computer created by INM in 1934 and financed by the USA

Electronic era
1946-1957
electronic devices advent of solid states

Events:
Transistors periods
Integrated circuits

Transistor 1947 
Wlenronic device
lightweight and faster

Teleghraph 
Voltaic Pile
Telephone and Radio