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2 boxes to contain the balls. a rotator to move the boxes vertically and horizontally.
a 4-stage viper slide kit to extend.
another rotator to move the extended from left to right

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How to Make Hydraulic Powered Robotic Arm from Cardboard

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2018 WARMAN National Competition & RMIT Competition

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Crane with 2 separate booms. Each Boom has a claw that opens and picks up tennis and squash balls, deposits into designated hole.