prov:value
| - Alternatively, spectrophotometer unit 20 is a time resolved spectrophotometer, as described in the U.S. Pat. Nos. 5,119,815 and 5,386,827, or a phase modulation spectrophotometer, as described in the U.S. Pat. Nos. 4,972,331 and 5,187,672, and in the co-pending U.S. patent application Ser.
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