This brochure advertises an oxygen sensor used to monitor the air in space capsules, submarines, space suits, fallout shelters, and decompression chambers.
Beckman Instruments, Inc. “Beckman Polarographic Oxygen Sensor,” September 1960. Beckman Historical Collection, Box 16, Folder 12. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/v118rf13p.
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