The AH-IV was a Czechoslovak-designed export armored fighting vehicle, classed as either a tankette or light tank, used by Romania during World War II, but having also been acquired by neutral Sweden and Iran. Modified AH-IV versions were built under license by Romania (R-1) and Sweden (Strv m/37). The Romanian vehicles saw action on the Eastern Front from Operation Barbarossa to the Vienna offensive. Twenty vehicles were sold after the war to Ethiopia, who used them until the 1980s. Description Českomoravská Kolben-Daněk was determined not to repeat the problems of its earlier Tančík vz. 33 tankette and gave the gunner a turret for better observation and all-around fields of fire for its new AH-IV tankette. It was assembled from a framework of steel "angle iron" beams, to which armor plates between thick were bolted. The driver sat on the right side using an observation port protected by bulletproof glass and an armored shutter. To his right was a small vision slit. Also to his right, in all models except the Swedish Strv m/37, was a light Zbrojovka Brno ZB vz. 26 or vz. 30 machine gun that was usually locked in place and fired using a Bowden cable. The gunner sat on the left and manned a small turret fitted with a ZB vz. 35 or ZB vz. 37 heavy machine gun in a ball mount. Most of the machine gun's barrel protruded from the mount and was protected by an armored trough. He had a large vision port to the right of the machine gun mount in the turret and a small vision slit on the left side of the superstructure. 3700 rounds were carried for the two machine guns. No radio was fitted. The , water-cooled, six-cylinder Praga engine produced at 2,500 rpm. It sat in the rear of the fighting compartment and drove the transmission via a drive shaft that ran forward between the driver and commander to the gearbox. Cooling was designed to draw air in through the commander's and driver's hatches. This had the advantage of rapidly dispersing gun combustion gases when firing, but several disadvantages. The constant draft generated by the engine greatly affected the crew during cold weather, an engine fire would force the crew to evacuate and the engine noise and heat increased crew fatigue. It had a top speed on the road of and a range between . The semi-automatic Praga-Wilson