Here is another robotic system that helps you get things done even when your hands are occupied. The Wearable Robotic Forearm is a second prototype of the Cornell robotic third arm. It can be used to pick up objects, hand things over to a partner, and even work with multiple tools when your hands are not free.
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This video from HRC2 Lab covers a few scenarios in which such a wearable robot comes handy.
Wearable Robotic Third Arm - 2nd Prototype - Scenarios
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