List of main battle tanks by generation

Columns: Name | Entered service in | Origin | Notes
Merkava Mark I | 1979 | Israel | First Main Battle Tank developed and used by Israel Defense Forces | Ch'onma-ho | 1980 | Soviet Union / North Korea | Copy of the T-62 ; later versions include upgrades | OF-40 | 1981 | Italy | Main Battle Tank used by United Arab Emirates | Tanque Argentino Mediano | 1983 | Argentina | Argentine Medium Tank developed from Marder IFV by Argentina and Thyssen-Henschel | Merkava Mark II | 1983 | Israel | Improved Merkava Mark I | T-55AM | 1985 | Soviet Union / Czechoslovakia | T-55 with new engine , FCS computer , BDD composite armor ( later active armor or ERA ; T-55AMV , T-55AMD ) , equipped with new APFSDS ammunition ( BM-20 or BM-25 ) . Frontal protection of T-55AM with BDD add-on equals first T-72s

Example questions:
What is the name of the second generation battle tank whose origin consists of four constituent countries ? | What is the name of the second generation battle tank whose origin had its roots in the 1917 October Revolution ? | What is the name of the second generation battle tank whose origin consists of 50 states ? | What is the name of the second generation battle tank whose origin is a unitary parliamentary democracy and constitutional monarchy ?

Answers:
Vickers MBT | T-64 | M60 Patton | FV 4201 Chieftain