The first prototype of the armored vehicle was in development from 1932 through 1934 under the supervision of engineer Gendron. The second prototype of 1935 successfully passed trials. The project was almost canceled due to insufficient funds, but the SOMUA company continued its development. An improved prototype was produced in 1938 and successfully underwent trials from 1938 through 1939. It saw service but never entered mass production due to delays with turret supplies.
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Time for the successive autoreloading of each shell into the magazine.
Characteristics are specified for Siege mode.
Characteristics are specified for Rapid mode.
Reload time of the first and second guns on double-barreled vehicles.
Characteristics are specified for vehicles with crews trained to 100%.