bdchakri.com

Printing Press---Johannes Gutenberg
Parachute---Louis-Sebastien Lenormand
Polio Vaccine---Jonas Edward Salk
Periodic Table---Dmitri Mendeleev
Penicillin---Alexander Fleming
Pacemaker---Rune Elmqvist
Petrol for Motor Car---Karl Benz
Refrigerator---William Cullen
Radium---Marie & Pierre Curie
Rubber (vulcanized)---Charles Goodyear
Rocket Engine---Robert H. Goddard
Radio---Guglielmo Marconi
Richter Scale---Charles Richter
Ship (Turbine)---Charles Parsons
Steam Ship---Robert Fulton
Steam Boat---Robert Fulton
Submarine---Cornelis Drebbel