Straight horn loudspeaker, 1921-1926
1921-1926
1921-1926
1926
1920-1925
1928
1920-1929
1921
1926
1927
1934
1923
1920-1930
1930
1925
circa 1927
circa 1930
1927
circa 1930
1932
circa 1930
1931
1931
1931
1927
1925
1924-1927
1922-1923
1922-1923
1922-1923
1922-1923
1920-1929
1920-1930
1925
1930
1927
circa 1920
1926
1932
2000-100 BCE
1920-1928
1924
1923
1928
1925-1927
1921-1931
circa 1920
1930-1931
1920
1922
1955; 1830
1921-1930