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Re: Carrying Tetras
Our arm has both a shoulder and elbow joint. Our "end-effector" (which is our undisclosable top secret design) is such that we can leave the shoulder all the way down, drop the elbow, grab a tetra, and then lift the elbow back into a vertical position and one face of the tetra nests nicely at about 2 feet above the ground directly above the front end of our robot.
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