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Inventions

Famous Scientists

Radar Robert Watson Watt
Radio Telephone Lee De Forest
Radio Transmitter Alexanderson
Radio signals G.Marconi
Railway Engine Stephenson
Raman Effect C.V.Raman
Razor (Safety) Gillette
Razor (Electric) Jacob Schick
Rayon Joseph Swann
Refrigerator Harrison & Catlin
Relativity, theory of A.Einstein
Replacing human heart Christian Barnard
Revolver Samuel Colt
Rh-factor Karl Landsteiner
Rubber (latex foam) Dunlop Co.
Rubber (tyres) Thomas Hancock
Rubber (vulcanised) Goodyear
Rubber (waterproof) Macintosh