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A possible attachment to a previously made Ball Machine.
K'nex Ball Machine Lift: Giant Ball Catapultby Mechanical Master
Connected Arm Lift, Sandroknexmaster's knex lift.by knex dude 2000
Knex Cleopatra ball machine.by knex dude 2000
K'nex Ball Machine Lift Instructions: Full Automatical Giant Ball Catapultby Mechanical Master
Project Accuracy-A K'nex Experimentby MechanicalCreationMaster
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