A prototype with an oscillating turret and an automatic loading system developed at the beginning of 1955 and based on the T42 experimental medium tank. The vehicle underwent trials from June 1955 through April 1956. The vehicle never entered mass production or saw service.
Time for the successive autoreloading of each shell into the magazine.
The technical characteristics shown are for the Siege mode
Characteristics are specified for a vehicle with crew members trained to 100%.