
Filing coherer, glass tube, fitted on to mounting bracket with terminals, 1894-1904
1894-1904
1894-1904
1929-1935
1900-1910
1900-1950
1900-1950
1900-1950
1898
1894-1904
1900
1921
1851
1852
1896
1870-1877
1879
1892
1931
1897
1900-1925
1920
1880
1907
circa 1925
1950-1960
1880-1920
1864-1900
1890-1910
1880-1920
2000-100 BCE
1870-1890
1870-1910
1880-1920
1860-1930
1901-1911
1890-1900
1861-1866
1880-1925
1901-1911
1950-1951
1953
1870-1920
1901-1913
1870-1880
1910-1933
1870-1920
1920-1928
1920-1928
1880-1920
1914-1918
1880-1925