View of a Mass Spectrometer 9 (MS-9) in use at the Exxon Research and Engineering Company analytical laboratory located in Baytown, Texas. On the left, Research Associate Henry Earle Lumpkin operates the console while, on the right, Senior Research Associate Thomas Aczel consults a chart. Manufactured in Manchester, England by Associated Electrical Industries (AEI), this MS-9 was the first installed in the United States.
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