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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