Toledo was famous for their sword steel. As I understand it they achieved this by hot welding a soft and hard steel together to produce swords which could have a sharp durable edge while also having good flexibility. Is this still being produced? Brands? Just swords, or also knives? Are the Fallkniven knives similar to this with their VG10 or CoS core and outer layers of 440C? Other knife brands using something similar to Toledo steel?