The press release announces an assay for precisely measuring, rather than estimating, rheumatoid factor.
|Place of creation|
Schneider, Ilene. “Beckman Rheumatoid Factor Assay System Provides Quantitative Measurement,” May 1, 1981. Beckman Historical Collection, Box 58, Folder 69. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/rv042t55x.
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