Not that it's any surprise, but according to a patent filing (which we were unable to ourselves unearth from the abyss that is the USPTO), iRobot would appear to still be working on the "Mowba," or whatever the hell the lawn-cutting robot is that they were talking up years ago. We're not sure you really need to pore over 80+ pages of sketches and drawings to get the idea though, especially since there are already a number of autonomous grass-cutting machines out there.

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