OT-26, OT-130, OT-133 and OT-134 flamethrower tanks

The OT-26 was the first of a series of flamethrower tanks based on the T-26 light tank.
The OT-130 was a second flamethrower tank based on the T-26 light tank, this time using the single turreted T-26 Model 1933
The OT-133 was the third of a series of flame thrower tanks based on the T-26 light tank, and was built around the improved T-26S
The OT-134 was the fourth and final entry in a series of flame throwers based on the T-26 light tank, and was the first to carry any other armament