
Filing coherer, glass tube, fitted on to mounting bracket with terminals, 1894-1904
1894-1904
1894-1904
1900-1910
1890-1894
1898
1894-1904
1900
1921
1880
2000-100 BCE
1880-1920
1914
1901-1911
1890-1900
1910-1940
1880-1925
1901-1911
1901-1913
1910-1933
1920-1928
1920-1928
1880-1920
1914-1918
1880-1925
Before 1932
1880-1925
1880-1930
1880-1930
1900-1920
before 1928
1901-1913
1940-1944
1890-1930
1891-1900
1938-1940
1901-1913
1900-1909
1932
1880-1915
1880-1925
circa 1920
1930-1931
1942
1914-1918
1880-1899
1923
1896-1920
1914-1924
1914-1924
1902
1901-1930