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* The system simply works by pulling the thread. The wheels which in fact act as gears make the swabs move in opposite direction. | * The system simply works by pulling the thread. The wheels which in fact act as gears make the swabs move in opposite direction. | ||
[[File:Mechanical System 1]] | [[File:Mechanical System 1.jpg]] | ||
[[File:Mechanical System 2]] | [[File:Mechanical System 2.jpg]] |
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