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Radio Guglielmo Marconi

Railway Engine George Stephenson

Refrigerator Oliver Evans

Rocket Engine Robert H. Goddard

Safety Elevator Elisha Otis

Seismograph Chang Heng

Steam engine Thomas Savery

Steam Turbine Charles Parson

Submarine Cornelius Drebbel

Telegraph Samuel Morse

Telephone Antonio Meucci

Telescope Hans Lippershey

Television John Logie Baird/Philo
Taylor Farnsworth

Thermometer Galileo Galilei

Transformer Ottó Bláthy, Miksa
Déri, Károly
Zipernowsky

Transistor John Bardeen, Walter
Brattain, and William
Shockley

Typewriter Christopher Latham
Sholes

Vernier Caliper Pierre Vernier

Video Games Ralph Baer