Mri                      1971     Damadian                     USA
Neon Lamp                1910     George Claude                France
Neutron                  1932     Chadwick                     Britain
Neutron Bomb             1958     Samuel Cohan                 USA
Nylon                    1937     Dr Wallace H Carothers       USA
Optical Fibre            1955     Narinder Kapany              Germany
Paper                   AD 105    -                            China
Pacemaker                1952     Zoll                         USA is
Pasteurization           1867     Lewis Pasteur                France
Pencil                   1792     Lacques Nicolas Conte        France
Periodic Table           1869     Mendeleyev                   Russia
Photocopier              1938     Carlson                      USA
Photoelectric Cell       1893     Julius Elster, Hans F Geitel Germany
Photo Film, Celluloid    1893     Reichenbach                  USA
Photo Film, Transparent  1884     Goodwin Eastman              USA
Photography (On Metal)   1826     J.N. Niepce                  France
Photography (On Paper)   1835     W.H. Fox Talbot              Britain
Photography (On Film)    1888     John Carbutt                 USA
Piano                    1709     Cristofori                   Italy
Pistol, Revolver         1836     Colt                         USA
Plutonium Fission        1940     Kennedy, whal,Seaborg,Segre  USA
Pop-Up Toaster           1927     Charles Strite               USA
Printing Press           1455     Johann Gutenberg             Germany
Printing (Rotatory)      1846     Richard Hoe                  USA
Printing (Web)           1865     William Bullock              USA
Proton                   1919     Rutherford                   New Zealand
Quantum Theory           1900     Plank                        Germany
Radar                    1922     AH Taylor and Leo C Young    USA
Radiocarbon Dating       1947     Libby                        USA
Radio Telegrapy          1864     Dr Mohlon Loomis             USA
Radio Telegrapy (Trans-  1901     G Marconi                    Italy
Atlantic)
Rayon                    1883     Sir Joseph Swan              Britain
Razor (Electric)         1931     Col Jacob Schick             USA
Razor (Safety)           1895     King C Gillette              USA
Refrigerator             1850     James Harrison, Alexandre    USA
                                  catlin
Relativity Theory        1905     Einstein                     Germany
Rubber (Latex Foam)      1928     Dunlop Rubber Co.            Britain
Rubber (Tyres)           1846     Thomas Hancock               Britain
Rubber (Vulcanised)      1841     Charles Goodyear             USA
Rubber (Waterproof)      1823     Charles Macintosh            Britain
Safety Pin               1849     Walter Hunt                  USA
Safety Razor             1903     King camp Gillette           USA
Seatbelt                 1959     Volvo                        Sweden
Self-Starter             1911     Charles F Kettering          USA
Ship (Steam)             1775     IC Perier                    France
Ship (Turbine)           1894     Hon Sir C Parson             Britain
Silk Manufacture        50 BC     -                            China
Skyscraper               1882     W Le Baron Jenny             USA
Slide Rule               1621     William Oughtred             Britain
Spinning Frame           1769     Sir Richard Arkwright        Britain
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