- (A) - A Soviet medium caliber AT-gun prior to the Zis-3, to be used in the early war (1939-41).
- (B) - A Soviet heavy field gun prior to the D1, to be used in the early war (1939-41).
- (C) - A German heavy tank superior in armour protection to the standard Pz.III’s and IV’s before 1941.
- (D) - Soviet self-propelled AT guns (tank destroyer) prior to the SU-76
- (A) - A Soviet medium caliber AT-gun prior to the Zis-3, to be used in the early war (1939-41).
- (B) - A Soviet heavy field gun prior to the D1, to be used in the early war (1939-41).
- (C) - A German heavy tank superior in armour protection to the standard Pz.III’s and IV’s before 1941.
- (D) - Soviet self-propelled AT guns (tank destroyer) prior to the SU-76