![](https://coimages.sciencemuseumgroup.org.uk/47/175/large_thumbnail_1970_0492__0001_.jpg)
Sample of gutta percha insulated cable, 1863-7
1863-7
1863-7
2000-100 BCE
1893-4
1934
1837
1837
1836
1837
1837
1837
1837
1837
1955; 1830
1837
1772 (original); 1919 (model)
1775-1799 (original); 1900-1907 (model)
1930 (replica); 1834 (original)
1986 (replica); 1501-1600 (original)
1837
1705-1737
1870-1877
1830 (original); 1967 (model)
1990-96
4000-2001 BCE
1888-185
1836
1836
1860-1820
1871-1830
1837
1837
1836
1837
1837
1837
1836
1836
2000-1350
1836
1883-01
1972-3
1870-1800
1837
1837
1837
1836
1945-50
3000 BCE
1990-95
1864-05