File:Telephone loading coils 1922.jpg
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![File:Telephone loading coils 1922.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/ad/Telephone_loading_coils_1922.jpg/489px-Telephone_loading_coils_1922.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 10:47, 3 May 2021 | ![]() | 719 × 882 (237 KB) | commons>Materialscientist | FFT |
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