Ridges on BX mmm blades

[coveredbridge]

I took the blades off my mmm to the local chain saw shop for sharpening. The owner commented that he never saw blades before with ridges on the cutting surface. I never thought about it before, but after he mentioned it I realized that I never have either.

Anyone know what the purpose of the ridges is?

Are they unique to Kubota blades, or is it just coincidence that I've never seen them before?

 

[art]

Are you refering to the grinding marks?

 

[coveredbridge]

I really don't think these are grinding marks. I've bought a lot of blades over the years for Woods and CC mowers, and I've seen grinding grooves on new blades, but these marks are different. They are raised ridges across the cutting surface, almost in a diagonal cross-hatch pattern.

 

[Shimon]

Like a serrated knife? Do you have any photos?