MIMIMARUME-GANNA is a plane that roundly finishes up cutting down as for the four corners of the comb.
It is small flat plane, and the angle of the blade is a rapid ascent of about 7degrees.

The under is MIMIMARUME-DAI, and this stand only for the corner rounding set up on TSUGU.
The corner of the comb is cut down based on this roundness.
Kiso no orokugushi ; The comb in japan.