Dewar-Gefäß, Doppelwandiges Isoliergefäß, verspiegelt zur längeren Bewahrung von temperaturkonstanten Labor-Substanzen. Hohlraum luftleergepumpt/evakuiert. Holzfuß mit Aufkleber "Dr. Heinrich Gockel. Fabrik Chemischer Apparate, Luisenstr. 21, (Berlin)".
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