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Descrition
English: 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.
Date
Fonte own work, Schulhistorische Sammlung Bremerhaven
Autor Hannes Grobe (talk)
w:en:Creative Commons
atribution
This file is licensed under the Creative Commons Attribution 3.0 Unported license.
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25 august 2008

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actual09:24, 25 august 2008Miniatura del version de 09:24, 25 august 20082,180 × 1,822 (714 KB)Hgrobe{{Information |Description=Air pump to demonstrate vacuum |Source=own work, Schulhistorische Sammlung Bremerhaven |Date=2008-08-25 |Author=~~~ |Permission=Attribution 2.5 |other_versions= }} {{cc-by-3.0}} Category:Physical_phenomena

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