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- Taqi al-Din (1526–1585) - Polymath, numerous mechanical innovations
- Dr. Andy Thomas - Australian Astronaut
- Nikola Tesla (1856–1943) - Serbian physicist, electrical and mechanical engineer whose work formed the theoretical and practical basis for modern AC power systems
- Richard Trevithick (1771–1833) - Steam power pioneer, designer of early high-pressure boiler (Cornish boiler) and "Puffing Devil" locomotive
Read more about this topic: List Of Mechanical Engineers