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Mechanical Science simple machines 8 sets in 1, used - $50 (Central District)
condition:
excellent
make / manufacturer:
Engino
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"Learn all about the 6 simple machines: the lever, the wedge, the wheel and axle, the screws, the inclined plane and the pulley, as well as two more mechanism: the gear and the linkage..." You can build 59 different models with this complete kit. Includes 68-page student-teacher's book, building booklets, and all original building materials.