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Image: Erfle 1917
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Erfle_1917.png (450 × 200 pixels, file size: 8 KB, MIME type: image/png)
Description: Erfle eyepiece.
Title: Erfle 1917
Credit: Own work
Author: Tamasflex
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: https://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
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