Desk telephone transmitter and receiver (sectioned), 1926.
1926
1926
1924
1925
1924
1925
1934
1924
1955; 1830
1925
1926
1926
2000-100 BCE
1925
1990-96
1924
1925-1926
1925
1934
1926
1930 (replica); 1834 (original)
1926
1926
1924
1924
1801-1892 (prepared); 1946 (element replaced)
1903 (original); 1982 (model)
4000-2001 BCE
1925
1925
1830 (original); 1967 (model)
1925
1924
circa 1924
1925
1924
1942-09
1942-07
1942-07
1963-01
1938-10
1947-04
1940-01
1946-01
1955-10
1947-05
1960-01
1941-11
1941-12
1966-07
1951-03