File:Fessenden synchronous spark transmitter.jpg
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![File:Fessenden synchronous spark transmitter.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Fessenden_synchronous_spark_transmitter.jpg/800px-Fessenden_synchronous_spark_transmitter.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 12:32, 3 May 2021 | ![]() | 1,956 × 1,335 (591 KB) | commons>Materialscientist | FFT |
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