File:Geissler in a Geissler tube.jpg

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Revision as of 09:05, 1 September 2018 by Admin (talk | contribs) (Heinrich Geissler delivers lecture from an experimental Geissler tube.)
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Heinrich Geissler delivers lecture from an experimental Geissler tube.

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current09:05, 1 September 2018Thumbnail for version as of 09:05, 1 September 2018998 × 600 (81 KB)Admin (talk | contribs)Heinrich Geissler delivers lecture from an experimental Geissler tube.

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