List of anti-tank guns

Columns: Caliber ( mm ) | Weapon name | Country of origin | Period
75 | Type 3 Ho-Ni III | Japan | World War II | 75 | Mareșal tank destroyer | Kingdom of Romania | World War II | 75 | M3 Gun Motor Carriage | United States | World War II | 76.2 | Marder III , Sd.Kfz . 139 | Nazi Germany | World War II | 76.2 | SP 17pdr , Valentine , Mk I , Archer | United Kingdom | World War II | 76.2 | 17pdr SP M10 Achilles | United Kingdom | 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