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- https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse English...(333 × 484 (75 KB)) - 20:20, 19 August 2024
- English German John Ambrose Fleming...(333 × 410 (131 KB)) - 09:23, 7 November 2023