RoboticsDexterity.com names the frontier of manipulation: multi-fingered hands, tactile sensing, and fine motor control. Dexterity is the bottleneck between today's arms and general-purpose humanoids.
Manipulation and hand dexterity are widely described as the hardest remaining problem in general-purpose robotics; locomotion is comparatively solved. A name that points at the bottleneck signals a company working on the hard part.
Robotic hands, grasping and manipulation research, or teleoperation data companies.
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