Edger that goes on to ztr mower

[williams lcm]

Seen a ztr today with an edger attachement on the side of the mower deck. Has anyone seen or have used one? This looks neat. Would not have to use a stick edger.

[Patriot Services]

I have seen them on guys mowing the highway medians and sidewalks. Not sure how well it would work on residentials, I guarantee I could be faster on foot with a stickedger. I assume its the one that looks like a big disc?
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