½s²Τ
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![]() v  | 
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![]() sjIΤ  | 
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![]() V―Τ@planetary gear  | 
    ![]() imΤ Nano-gear  | 
  
![]() n[jbN  | 
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![]() ρ~`Τ Noncircular Gears  | 
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![]() []  | 
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    Ξhelical involute^sycloid R^Q{@Θ~  | 
  
