User talk:92.21.143.90
Duplex
Please refrain from making unconstructive edits to Wikipedia, as you did to Duplex (telecommunications. Your edits appear to constitute vandalism and have been reverted. If you would like to experiment, please use the sandbox. Thank you. カラム 01:20, 9 November 2009 (UTC)
 | This is the discussion page for an IP user, identified by the user's IP address. Many IP addresses change periodically, and are often shared by several users. If you are an IP user, you may create an account or log in to avoid future confusion with other IP users. Registering also hides your IP address. |