 Several other aspects of the latest Strida 3 to 5.x versions are currently covered by patents in various countries, including the folding handle bar system US7243573, hub and locking system US7367632, front joint system US7681900, with other patents pending.The Patents, Trademark, Copyright and other IP are owned by Ming Cycle, Taiwan.Some components of the Series 3 to Series 5 machines are interchangeable but other significant components and sub-assemblies are not.