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    50% OFF
    5-speed manual transmission dynamic model (with reverse gear selector)
    $69.99 $139.98
    50% OFF
    6AT Transmission Planetary Gear Set Model - Automatic Transmission 6 Forward and Reverse Multi-plate Clutch
    $69.99 $139.98
    50% OFF
    Automotive differential Torsen A-type limited slip differential dynamic model
    $39.99 $79.98
    50% OFF
    Internal structure model of mechanical watches - working principle of tourbillon DIY movement spring gear device
    $39.99 $79.98
    50% OFF
    Tourbillon Model, Mechanical Gear Transmission Principle, Spring Power Device
    $59.99 $119.98
    50% OFF
    Double-axis tourbillon mechanical pendulum clock model
    $69.99 $139.98
    50% OFF
    Three-axis tourbillon gear transmission model | Mechanical pendulum clock DIY technology production
    $69.99 $139.98
    50% OFF
    Pendulum Clock Model | Galileo Pendulum Clock Mechanical Clock Educational Assembly Science Physics Experimental Equipment
    $69.99 $139.98
    50% OFF
    Mechanical Art Model | Gear Drive Educational Instrument: Tourbillon Principle Demonstration
    $49.99 $99.98
    50% OFF
    Tourbillon Mechanical Model, Escapement Principle Device, Spring-Powered Gear Transmission Teaching Model
    $49.99 $99.98
    50% OFF
    Mechanical Design Tourbillon Model, Spring Power, Gear Set, Escapement, and Pendulum Clock Principles DIY Teaching Model
    $59.99 $119.98
    50% OFF
    Planetary gear principle demonstration dynamic model
    $39.99 $79.98
    50% OFF
    Open differential car model with differential lock
    $39.99 $79.98
    50% OFF
    Torsen B-type limited slip self-locking differential dynamic model
    $39.99 $79.98
    50% OFF
    Car McPherson suspension system model | Perfect presentation of mechanical charm and principles
    $119.99 $239.98
    50% OFF
    Simple mechanical pendulum clock principle model | Scientific teaching aids to explore the mystery of time
    $49.99 $99.98
    50% OFF
    Watch Disassembly Tourbillon Gear Model
    $49.99 $99.98
    50% OFF
    Tourbillon Gear Transmission Mechanical Model
    $49.99 $99.98
    50% OFF
    Tourbillon Model, Mechanical Spring Drive, Clockwork Internal Structure, and Escapement, STEM Science Museum Teaching Model
    $39.99 $79.98
    50% OFF
    Mechanical Tourbillon Model Clock | Exploring the Precision of Time
    $49.99 $99.98
    50% OFF
    Tri-Axis Tourbillon Mechanical Watch Teaching Experimental Equipment
    $69.99 $139.98
    50% OFF
    Four-Speed Manual Transmission Model
    $49.99 $99.98
    50% OFF
    Acrobatic Colorfull Stacking Chair Block
    $9.99 $19.98
    50% OFF
    MR.CHOO Wooden Irregular Puzzle “The Starry Night”
    $49.99 $99.98
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