Seat belt that required a particular technical approach would rapidly become dated as motor manufacturers would tool up for a particular standard which could not easily be changed. For example, in 1969 there were competing designs for lap and three-point seat belts, rapidly tilting seats, and airbags being developed. But as countries started to mandate seat belt restraints the global auto industry invested in the tooling and standardized exclusively on seat belts, and ignored other restraint designs such as air bags for several decades As of 2016, seat belt laws can be divided into two categories: primary and secondary. A primary seat
Compulsory license exported to certain countries (principally, those on the UN's list of least-developed countries and certain other countries having per-capita incomes of less than US$745 a year). However, it should be noted that this is not limited to only least-developed countries - every country that is a member of the WTO has the right under the TRIPs agreement to issue a compulsory license if there is a public health need. Some countries simply choose not to issue these licenses. From the text of the agreement: "Each member has the right to grant compulsory licences and the freedom to determine the grounds