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Joytopiaminds Retro Steam Engine Model Kits, Adjustable Speed Alcohol-Powered Stirling Engine with Ball Bearing Flywheel for Physical Science Experiment Display ️ Adjustable Speed Control: Unique top-mounted knob regulates airflow to dynamically control engine speed, allowing hands-on observation of piston mechanics and thermodynamics principles Precision Ball Bearing Flywheel: High-sensitivity ball... Joytopiaminds Retro Steam Engine Model Kits, Adjustable Speed Alcohol-Powered Stirling Engine with Ball Bearing Flywheel for Physical Science Experiment Display

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