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39/40 Salt tester
Used in the laboratory by employees of the Ruggles and Rademaker Salt Plant, this glass cylindrical item was used to test salt by placing a dab of it into the top crevice.
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Used in the laboratory by employees of the Ruggles and Rademaker Salt Plant, this glass cylindrical item was used to test salt by placing a dab of it into the top crevice.