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
Agriculture in Communist Czechoslovakia that the efficiency of animal husbandry had improved. Performance in the agricultural sector as a whole remained uneven in the 1980s, however. Although some outstanding farms were obtaining excellent grain yields, the uneven quality of farm management contributed to large discrepancies in performance between farms. Agriculture in Communist Czechoslovakia Czechoslovakia was a socialist country from 1948 till the Velvet Revolution of 1989. Those who did not comply with its diktats were punished. Hundreds of people were executed in show trials. 95% of all privately owned companies were nationalised. 95% of farms were nationalized. No one could own more than 50