In the late 1950s, the Czechoslovakian government prioritized mastering Soviet medium tanks. At the same time, they also made attempts to build their own vehicles, which included the TBT (Těžký bojový tank) project. It was developed with the T-10 heavy tank in mind and featured forged bent armor plates, since cast plates were less durable. The vehicle was based on a mobile heavy tank concept capable of cooperating with medium tanks, but Czechoslovakian industry did not manage to build a prototype. The TBT remained only in blueprints.