starting research into cold war era (1950's thru 1980's)

[Conquistador]

I am looking for a time line I once found but did not bookmark for when tanks achieved IOC (initial Operating Capacity,) when they achieved FOC (Full Operating Capacity - i.e., deployed in effective numbers,) and when they were phased out by their initial users.  Mostly for NATO and WP armies but others of value further on down the line.

Gracias,

Glenn