
Sample of gutta percha insulated cable, 1863-7
1863-7
1863-7
1850
1851
2000-100 BCE
1836
1838
1839
1842
1841
1839
1850
circa 1850
1846
1840
1930 (replica); 1834 (original)
circa 1850s
1839
1846
1990-96
1849
1849
1851
circa 1840
1840-1850
1851
1844
1830 (original); 1967 (model)
1837-1840
1851
1851
1849
circa 1848
1845
1772 (original); 1919 (model)
1934
1850
1845-1851
1870-1877
1705-1737
1775-1799 (original); 1900-1907 (model)
1801-1840 (original); 1901 (model)
1837
1842
1850
1839-1840
1838
1837-1846
1840
1837
circa 1842