Irish inventions:
1844 Hypodermic Syringe, Francis Rynd (1811 - 1861) of Dublin
1875 First commercial refrigerator, Michael Cudahy (1841 - 1910) of Callan, Co. Kilkenny
1881 First successful submarine, John Philip Holland (1841 - 1914) of Liscannor, Co Clare
(Yeah, the Americans made one before but that was a small egg-shaped joke of a submarine, this was the first "proper" one)
1894 First practical system of colour photography, John Joly (1857 - 1933) of Hollywood, Co. Offaly
1908 Electrocardiograph (ECG), Lucien Bull (1876 - 1972) of Dublin
1931 First nuclear particle generator, Ernest Walton (1903 - 1995) of Dungarvan, Co. Waterford
1935 Tractor-mounted plough, Harry Ferguson (1884 - 1960) of Hillsborough, Co. Down
1946 Aircraft ejector seat, James Martin (1893 -1981) of Crossgar, Co. Down