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https://www.unece.org/trans/areas-of-work/vehicle-regulations/agreements-and-regulations/un-regulations-1958-agreement/regulations-addenda-to-the-1958-agreement/old-version-of-regulations-pages/regs-1-20.html
 
https://www.unece.org/trans/areas-of-work/vehicle-regulations/agreements-and-regulations/un-regulations-1958-agreement/regulations-addenda-to-the-1958-agreement/old-version-of-regulations-pages/regs-1-20.html
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https://en.wikipedia.org/wiki/World_Forum_for_Harmonization_of_Vehicle_Regulations#Type_approval
 
https://en.wikipedia.org/wiki/World_Forum_for_Harmonization_of_Vehicle_Regulations#Type_approval