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| Date: | 03 02 1934 |
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| Description: | A man in the camera room at the Wisconsin Engraving Company plant, 109 S. Carroll Street, is coating the wet plate negative with rubber and collodion to ma... |
| Date: | 10 30 1931 |
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| Description: | A food scientist looking through a microscope at Oscar Mayer. |
| Date: | 09 02 1931 |
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| Description: | Dr. Claude Reading, new director of the state veterinary control laboratory in Agriculture Hall at the University of Wisconsin, at work in his laboratory. |
| Date: | 04 12 1928 |
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| Description: | A man is measuring chemicals on an old scale in Ricketts laboratory at the Agriculture Chemistry Building, on the University of Wisconsin campus. |
| Date: | 04 12 1928 |
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| Description: | View of a man taking Sodium Chloride (NaCl) out of a jar to measure it on an old scale on a table. The man is working in the Ricketts laboratory at the Agr... |
| Date: | 04 12 1928 |
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| Description: | Man measuring chemical CaCO4 on Toledo Scale in Ricketts laboratory at Agriculture Chemistry Building, University of Wisconsin. |
| Date: | 04 12 1928 |
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| Description: | Man taking chemical CaCO4 out of a jar to measure it on Toledo Scale in Ricketts laboratory at Agriculture Chemistry Building, University of Wisconsin. |
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