User talk:27.4.81.65

June 2013
Hello, I'm TCN7JM. I wanted to let you know that I undid one of your recent contributions, such as the one you made with this edit to Types of concrete, because it didn’t appear constructive to me. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks. T C  N7 JM  06:43, 26 June 2013 (UTC)