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20

Post-office first established in United States, at New York 1710
Diamond mines of Brazil discovered 1730
Chain bridges first constructed 1741
Banknotes first issued 1745
Handkerchiefs first made at Paisley, Scotland 1748
China ware first made in England 1752
Identity of lightning and electricity discovered by Franklin 1752
Lightning rods invented by Franklin 1770
Argand lamp invented 1780
Banks first established in United States 1781
Sunday schools first established in England by R. Raikes 1784
Railroads first built in England 1791
Cotton gin invented by Whitney 1794
Vaccination first practised by Jenner 1796
Lithography invented 1800
Lifeboats invented 1802
Kaleidoscope invented at Edinburgh 1814
Musical boxes first invented 1817
Gas first used for lighting streets in United States 1820
Stomach pump invented 1828
Gun cotton first made 1846
Steel pens first made 1803
Potatoes first cultivated in the United States 1719