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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
Source own work, Schulhistorische Sammlung Bremerhaven
Author Hannes Grobe (talk)
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25 Okosita 2008

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current09:24, 25 Okosita 2008Thumbnail for version as of 09:24, 25 Okosita 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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