This sorter was built in 1967 by Mack Fulwyler. It was shipped to Brown University to the laboratory of Dr. Boris Rotman and operated for 38 years as it is shown here. It cost $5000 to build. This unit had some slight modifications from the original instrument built in 1965. This instrument is the only surviving version of the original invention. It was displayed at the ISAC XXIII Congress in Quebec City, and is currently on display at the Purdue University Cytometry Laboratories. It will be donated to the Smithsonian Institution for long-term preservation.