Image: Kolbenluftpumpe hg
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Description: Vacuum pump and bell jar for vacuum experiments, used in science education during the early 20th century, on display in the Schulhistorische Sammlung (School Historical Museum), Bremerhaven, Germany.
Title: Kolbenluftpumpe hg
Credit: own work, Schulhistorische Sammlung Bremerhaven
Author: Hannes Grobe (talk)
Usage Terms: Creative Commons Attribution 3.0
License: CC BY 3.0
License Link: http://creativecommons.org/licenses/by/3.0
Attribution Required?: Yes
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