 When this tank proved to be unsatisfactory, an even more advanced type was taken into production for the American forces, the M48 Patton.Thousands of superfluous M47s were leased for free to the European allies, France included.The AMX 50 was suddenly made redundant as a medium tank, despite a "100 mm" prototype being sent in 1952 to the Aberdeen Proving Grounds for, successful, tests.