Morse key with send-receive switch, 1900-1920
1900-1920
1900-1920
1959-1967
1830-1900
1858
1900-1969
1900-1960
1906-1959
1922
1925-1935
1921-1940
1905
1880-1950
1897-1926
1870-1930
1960-1980
1960-1980
circa 1970
1935-1936
1916-1918
1900-1969
1915-1920
1968
1935
1880-1920
1880-1910
1977
1936-1968
1900-1969
1974-06-14
1953-1980
1961
1895-1900
1841
1947
1967
1900-1969
1895-1900
1900-1969
1950
circa 1950
1889