
Filings coherer, small glass tube with bulb at one end, 1894-1904
1894-1904
1894-1904
1894-1904
1900-1920
1898
1894-1904
1900-1910
1894
1894-1904
1902
1908
1904
1935
1936
1914-1918
1928
1901-1916
1930
1920-1930
1914-1918
1900-1916
1900-1913
1904
1900
1914
Before 1932
1900-1914
1901-1920
1914-1918
1900-1920
1935
1901-1905
1915-1918
1914-1918
1913-1923
1907-1930
circa 1919
1931
1895-1905
1900-1920
1896-1900
1914
1918-1920
1903
1915
4000-2001 BCE
1914-1918
1901-1930
1923
1900-1920
1897