
Amplion loud speaker with wooden horn, 1925
1925
1925
1927
1928
1955; 1830
1925-1928
circa 1927
1924
1926
1927
1927
1925
1928
1928
1925
2000-100 BCE
1923
before 1928
1927-1929
1925-1927
1923
1924-1927
1924
1934
1927
1926
1926
1924
1926
1801-1892 (prepared); 1946 (element replaced)
1925
1925
1927
1926
1926
1839 (original); circa 1988 (replica)
1930 (replica); 1834 (original)
1926-1928
1923
1923
1923
1924-1927
1990-96
1929
circa 1929
1924
circa 1927
1929
1925
1928
1903 (original); 1982 (model)