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
Warsaw Pact invasion of Czechoslovakia first American ambassador to a truly free Czechoslovakia. In Finland, a neutral country under some Soviet political influence at that time, the occupation caused a major scandal. The People's Republic of China objected furiously to the so-called "Brezhnev doctrine", which declared the Soviet Union alone had the right to determine what nations were properly Communist and could invade those Communist nations whose communism did not meet the Kremlin's approval. Mao Zedong saw the Brezhnev doctrine as the ideological justification for a Soviet invasion of China, and launched a massive propaganda campaign condemning the invasion of Czechoslovakia, despite his own earlier