Keywords: Spectrophotometer.jpg Diagram of the Model DU Spectrophotometer showing Mounting Block Cell Compartment Phototube Housing and Lamp Housing detached from the Monochromator National Technical Laboratories Beckman Bulletin 91-C South Pasadena California 1947 National Museum of American History Behring Center Smithsonian Institution and Beckman Coulter Inc From exhibition Visible Proofs Forensic Views of the Body U S National Library of Medicine 8600 Rockville Pike Bethesda MD 20894 2006-02-16 National Institutes of Health Health Human Services PD-USGov-NIH PD-USGov Spectrophotometers 1940s diagrams |