User talk:67.53.252.2

May 2019
Hello, I'm Norvianii. I noticed that you added or changed content in an article, Heat and moisture exchanger, but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so. If you need guidance on referencing, please see the referencing for beginners tutorial, or if you think I made a mistake, you can leave me a message on my talk page. Thank you. Norvianii (talk) 15:05, 30 May 2019 (UTC)
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November 2019
Hello, I'm CLCStudent. I wanted to let you know that one or more of your recent contributions to Billings (surname) 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. CLCStudent (talk) 18:50, 13 November 2019 (UTC)
 * If this is a shared IP address, and you did not make the edits referred to above, consider creating an account for yourself or logging in with an existing account so that you can avoid further irrelevant notices.