User talk:2605:A000:121B:20AC:2191:B38F:6733:29EE

December 2019
Hello, I'm Train of Knowledge. I wanted to let you know that one or more of your recent contributions to National Advisory Committee for Aeronautics have been undone because they did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the help desk. Thanks. Train of Knowledge (Talk|Contribs) 22:40, 11 December 2019 (UTC)
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