Primax moving iron loudspeaker, 1924-1927
1924-1927
1924-1927
1980
1970-1985
1927-1930
1940
1938
1935-02-22
25 June 1934
25 June 1934
1935-1940
1971
1970-1985
25 June 1934
25 June 1934
1968
1950-1970
1960-1970
1960-1970
1960-1975
1940-1970
1960-1980
1970-1985
circa 1955
1980-1985
1986
1932
1932
1980-1985
1950-1970
1950-1970
1945-1960