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By
cruelprinta
5
designs
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186
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16251
Balloon Powered Single Cylinder Air Engine Open Chassis
Greg Zumwalt
41
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14209
Balloon Powered Single Cylinder Air Engine Toy Train
Greg Zumwalt
108
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15401
Tabletop Tri-Mode Spring Motor Rolling Chassis
Greg Zumwalt
33
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3793
Nespresso Capsule Recycler
Anthony L
145
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21345
Dual Mode Windup Car
Greg Zumwalt