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Filter: Subject of scientists
Filter: Subject of machinery
| Date: | 02 1977 |
|---|---|
| Description: | A man is kneeling on the ice and snow at Potter's Lake. He is running a machine that is testing the oxygen levels in the water, while recording the results... |
| Date: | 1922 |
|---|---|
| Description: | Interior view of two unidentified male scientists working with various paper testing apparatus in the corner of a chemical laboratory. |
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