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There is a page named "File:Tronnier US2746351A (Skoparon, 1952).svg" on Wikipedia
Commons Attribution-Share Alike 4.0 truetrue English ''Skoparon'' lens designed by Tronnier (1952) for Voigtlander. author name string: Mliu92 Wikimedia...(750 × 700 (2 KB)) - 16:53, 18 October 2023
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