List of main battle tanks by generation

Columns: Name | In service from | Origin | Notes
T-80 | 1976 | Soviet Union | World 's first turbine engine equipped tank . Though the Swedish Stridsvagn 103 that entered service in 1960s used a turbine engine alongside a diesel . However , T-80 in Hilmes 's book is very different to a T-80 in real world , and early models of the T-80 offer no big differences compared to T-64A in overall performance . So models prior to the T-80B should be regarded as Second generation intermediate | Leopard 2 | 1979 | West Germany | Replaced Leopard 1 | MBT-80 | 1979 | United Kingdom | Prototype , never entered service | M1 Abrams | 1980 | United States | Replaced M60 Patton | FV4030/4 Challenger 1 | 1983 | United Kingdom | Replaced FV 4201 Chieftain | AMX-40 | 1983 | France | Prototype , never acquired by the French Army | M-84 | 1984 | Yugoslavia | A Yugoslav variant of the soviet T-72

Example questions:
How many countries use the export version of the third generation main battle tank that went into service in 1980 ? | Who was the chief designer of the third generation main battle tank that originated in the Soviet Union ? | What year was the third generation main battle tank that originated in France discontinued ? | What is the combat weight of the third generation main battle tank that was in service from 1996 ? | Which company developed the third generation main battle tank that originated in Croatia ?

Answers:
5 | Nikolay Popov | 1990 | 50 tons | Đuro Đaković