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Finally, the development of the heavy tanks was stopped and MBT tanks were developed based on medium tank series.

сколько в этой структуре было типов танков – отдельная песня
How many tank types were in this structure is the subject to discuss somewhere else (literally, quite colloquial - this is the subject...

система воздухопитания - air utilization (using / consumption etc) system includes air intake, air filtration and all the other things dealing with air in the machine.

жесткий насадок (looks...