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T16 Antique Roller Tractor Model with 1.6cc Mini Horizontal Air-cooled Single-cylinder Gasoline IC Engine

R28 4.3CC Mini OHV V-Twin V2 Engine Double-cylinder Four-stroke Motorcycle Gasoline IC Engine Model

L4 Diesel Engine Model Kit that Works - Build Your Own Diesel Engine - TECHING 1: 10 Full Metal Mini L4 4 Cylinder Engine OHV Inline 4 Cylinder Engine Model Kit 300+PCS

3D Puzzle Model Kit Mechanical Underwater Seahorse with Lamp Metal Games DIY Crafts Creative Gift - 2100Pcs

Pumping Unit that Works - Oil Pump Jack Model Kit - TECHING 3D Metal Oilfield Working Equipment with Light Oil Rig Educational Toys Collection 219Pcs

ENJOMOR Mini Beta Hot Air Stirling Engine Model External Combustion Engine Model Educational Toy