SP 100 infrared prism spectrophotometer by Unicam Instruments
1957-1965
1957-1965
1945-1950
1945-1950
1970-1975
1950
1949
1951-1960
1945-1950
1949
1949
1967-1973
1949
1966-1968
1956
circa 1950
1955-1958
1950-1960