List of anti-tank guns

Columns: Caliber ( mm ) | Weapon name | Country of origin | Period
37 | M6 Gun Motor Carriage | United States | World War II | 47 | Laffly W15TCC | France | World War II | 47 | Panzerjäger I | Nazi Germany | World War II | 47 | Semovente 47/32 | Italy | World War II | 57 | AEC Mk I Gun Carrier | United Kingdom | World War II | 57 | 6 pounder Anti-tank Gun portee | United Kingdom | World War II | 57 | T48 Gun Motor Carriage | United States | World War II

Example questions:
How many different zones of climate were in the nation which first manufactured the Self-propelled anti-tank gun ZiS-30 ? | What form of government was the nation which first manufactured the Self-propelled anti-tank gun Panzerjäger I ? | How many countries make up the nation which first manufactured the Self-propelled anti-tank weapon AEC Mk I Gun Carrier ? | Which people resided in the middle of the nation which first manufactured the Self-propelled anti-tank gun Semovente 47/32 ? | Which country borders the nation across from Mexico which first manufactured the Self-propelled anti-tank weapon M6 Gun Motor Carriage ?

Answers:
five | totalitarian | four | Etruscans | Canada