C.W. transmitter/receiver, Mk.1, 1917
1917
1917
1967
1910
1898-1913
1963
1967
1936
1943
1910
1943
1950
circa 1930
1952
1939
circa 1930
1946
1962
1915
1937
1965
1955
1943
1963
1956
1962
1952
1948
1958
1943
1943
1967
1954
1943