Straight horn loudspeaker, 1921-1926
1921-1926
1921-1926
1935
1926
1920-1925
1928
1935
1936
1920-1929
1934
1921
1926
1934
1927
1934
1923
1936
1920-1930
1930
1925
1935
circa 1927
circa 1930
1927
circa 1930
1935
1935
1932
1934
circa 1930
1931
1931
1931
1927
1925
1924-1927
1922-1923
1922-1923
1933
1922-1923
1922-1923
1920-1929
1920-1930
1925
1930
1927
circa 1920
1934
1926
1932
2000-100 BCE