Tectonic Model set, Demonstrate plate, plate boundary interactions and the geometry and relative motions of faulting of geologic layers using 3-D manipulative models, Versatile kit contains a Fault Model Set of 5 manipulatives and a Tectonics Sand Layer Model
Planetary Gear Unit for Students, mall-size unit for explaining the principle of planetary gear. By setting the internal, sun and pinion gears at different motions
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