Changes

The first important change occurred after the attempts of mongol invasion in

The first important change occurred after the attempts of mongol invasion in

the XIII century. The blades becomes more sturdy on the upper part, the

the XIII century. The blades becomes more sturdy on the upper part, the

"Ikubi-Kissaki", a sort of very small point, was replaced with other, larger

"Ikubi-Kissaki", a sort of very small point, was replaced with other,  

types that left more rooms to repairs after damages.  

larger types that left more room to repairs after damages.  

A second one, only temporary, was the one made in Nanbokucho era, when

A second one, only temporary, was the one made in Nanbokucho era, when