Zenith X-ray tube and shield
1901-1913
1901-1913
1960-2007
1950s
1950s
1930-1950
1930-1950
1930-1940
1930-1950
1965-1975
1974-1984
1980
circa 1960
1975-1984
1974-1984
1930-1940
1965-1975
1854
1930-1940
1930-1960
1961-1975 (estimated)
1951-1960
1978-1980
1951-07-27
1953-08-14
1843
1950-1960
1984
1982-1987
1974-1984
1900-1990
1900-1990
1900-1990
1900-1990
1955-05-10
1955-06-17
1951-07-27
1957-07-18
1900-1990
1900-1990
1900-1990
1950-1970
1701-1800
circa 1945-1950
1955-1960
1931-06-02
29 March 1946
08 November 1957