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- circa 1970
The instrument monitors pH, partial pressure of carbon dioxide, partial pressure of oxygen, and temperature. It sits before what appears to be a paper backdrop taped in place.
- after 1970 – before 1991
Stamp depicts Alexander Fleming and penicillin.
Advertisement for the many Beckman Instruments products that are used in hospital and health services, including glucose analyzers, liquid scintillation counters, spectrophotometers, and oxygen analyzers (among many…