In August–October 1933 this armoured personnel carrier has passed extensive tests at Kubinka proving ground.
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This ST-26 prototype was also tested at the Kubinka Tank Proving Ground, and participated in military exercises of the Leningrad Military District in 1938.
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Trials performed in October 1940 in Kubinka proving ground demonstrated that the design needed improvement.
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The single vehicle was built by the Military Supply Depot No. 37 in Moscow in 1937 and tested at the Kubinka Tank Proving Ground in January–February 1938.
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