Dunno if either system other can be called the official one, but it (as usual) comes down to Americans creating solutions for non-existing problems :P https://

Dunno if either system other can be called the official one, but it (as usual) comes down to Americans creating solutions for non-existing problems :P https://en.wikipedia.org/wiki/Long_and_short_scales https://en.wikipedia.org/wiki/Long_and_short_scales