关于M48,我也照抄一下维基百科:
M48: Differed from the M47 in having yet another new turret design and a redesigned hull, doing away with the bow machine gun position, featuring the M41 90 mm gun. These turrets give the M48 its distinctive non-M26 style look. Originally the gun featured a Y-shape muzzle brake, but this was changed to the more characteristic T-shape.
M48C: Over a hundred original production hulls were found to be lacking correct ballistic protection and were relegated to training as the M48C.
M48A1: New driver hatch and M1 commander's cupola, allowing the M2HB .50 caliber machine gun to be operated and reloaded from within the vehicle.
M48A2: improved powerpack and transmission, redesigned rear plate, and improved turret control.
M48A2C: M48A2s with an improved rangefinder, M17, new ballistic drive and bore evacuator for the main gun, and the auxiliary tensioning wheels were deleted.
M48A3: Refit of M48A1s with diesel engines and a new fire control system.