opereting systen
commonly opereting machine that used for tecnological and educational reserch
The invention of money supplemented the barter system by providing a nonperishable medium of exchange.
it was the worst invention
Nintendo was the first system!!!!!
Nintendo was the first system!!!!!
Federal
It was the irrigation system.
2011 was the date of invention
Security System
It is a natural system that evolved and developed with each species.
Edisons approach is to turn his inventing to its system.