
Wheatstone's portable ABC telegraph, 1858
1858
1858
1900-1969
1959-1967
1900-1960
1900-1920
1830-1900
1906-1959
1925-1935
1921-1940
1922
1905
1897-1926
1870-1930
1880-1950
circa 1970
1968
1935
1960-1980
1960-1980
1916-1918
1935-1936
1900-1969
1915-1920
1880-1920
1977
1936-1968
1880-1910
1900-1969
1895-1900
1953-1980
1974-06-14
1961
1895-1900
circa 1950
1950
1947
1841
1967
1900-1969
1895-1900
1900-1969
1947
1956
1982-1992
1947
1889
1880-1902