1949 – The first jet-powered airliner, the de Havilland Comet, made its first flight. Previously jet engines had only been used to power small fighter aircraft.
1981 – Microsoft bought the rights for QDOS (Quick and Dirty Operating System) from Seattle Computer Products for $25,000.
1993 – Microsoft released Windows NT 3.1, completing its attempt to build an advanced 32-bit operating system from scratch.
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