User talk:Umuterdogan61

May 2023
Hello, I'm Riverbend21. I wanted to let you know that one or more of your recent contributions&#32;to Polybutylene terephthalate have been undone because they did not appear constructive. If you would like to experiment, please use your sandbox. If you have any questions, you can ask for assistance at the Teahouse or the Help desk. Thanks. Riverbend21 (talk) 12:15, 20 May 2023 (UTC)