The V-2 (German: Vergeltungswaffe 2, “Retribution Weapon 2”), with the technical name Aggregat 4 (A4), was the world’s first long-range[4] guided ballistic missile. The missile, powered by a liquid-propellant rocket engine, was developed during the Second World War in Germany as a “vengeance weapon” and assigned to attack Allied cities as retaliation for the Allied bombings against German cities. The V-2 rocket also became the first artificial object to travel into space by crossing the Kármán line with the vertical launch of MW 18014 on 20 June 1944.
invented by Xerox PARC
Produced at Xerox PARC by Butler Lampson, Charles Simonyi and colleagues.
invented by Chuck Hull
Stereolithography (SLA or SL; also known as stereolithography apparatus,…
invented by Norikazu Sawazaki
A video tape recorder (VTR) is a tape recorder designed to record and play back…
invented by Frits Zernike
Phase-contrast microscopy (PCM) is an optical microscopy technique that…
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