"Airway" vacuum cleaner, c.1930
1930
1930
1927
circa 1930
1955; 1830
1927-1929
circa 1927
circa 1930
circa 1930
1934
1927
before 1928
2000-100 BCE
1928
1927
1928
1928
1927
1930
1924
1927
1930 (replica); 1834 (original)
1930
circa 1927
1929
1903 (original); 1982 (model)
1990-96
1929
circa 1929
1930
1930
1934
1830 (original); 1967 (model)
1930
1927
4000-2001 BCE
1801-1892 (prepared); 1946 (element replaced)
1928
circa 1930s
1930s
1930s
circa 1930s
circa 1930s
1930s
circa 1930s
circa 1930
circa 1930s
circa 1930s
1929
circa 1930s
1930