When did czechoslovakia become a soviet satellite nation?

On January 1st 1992
hoped this helped 
:3

1. Although the sight of television was wizardly, it made our veiws of the world changed as every night in the year of 1955 broadcasted the vietnam war, but besides that fact, it brought us a new form of entertainment that changed society forever.
2 it formed a new way of transportation, brought in newer jobs, and gave our military new vehicles such as the tank.