![](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
1855
2000-100 BCE
1854
1893-4
1855
1934
1854
1853
1853
circa 1854
circa 1854
1855
1955; 1830
1854
1772 (original); 1919 (model)
1801-1840 (original); 1901 (model)
1775-1799 (original); 1900-1907 (model)
1855
1930 (replica); 1834 (original)
1855
1986 (replica); 1501-1600 (original)
1934
1705-1737
1870-1877
1855
1855
circa 1854
1830 (original); 1967 (model)
1855
1990-96
1853
4000-2001 BCE
1888-185
1860-1820
1871-1830
1855
circa 1855
1855
1854
1853
1855
1853
1855
1853
1855
1832-1850
1853
1854
1854