![](https://coimages.sciencemuseumgroup.org.uk/37/620/large_thumbnail_1961_0057__0002_.jpg)
Amplion loud speaker with wooden horn, 1925
1925
1925
1921-1926
1924-1927
1900-1930
1930-1950
1948-1955
1930-1950
1982
1925-1935
1925-1935
1926-1929
1945-1955
circa 1925
1937
1928
1929
1940-1950
1930-1950
1930-1939
2017
1969
1926-1929
1969
1973
1970-1988
1927-1933