
C.W. transmitter/receiver, Mk.1, 1917
1917
1917
1967
1962
1950
1910
1952
1962
1936
1955
circa 1930
1948
1958
1943
1943
1943
1967
1967
1963
1954
1915
1946
1898-1913
1910
1963
1956
circa 1930
1943
1937
1943
1939
1943
1943
1952
circa 1937
1951-1960