Talk:Duplex canceller

External links modified
Hello fellow Wikipedians,

I have just modified one external link on Duplex canceller. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
 * Added archive https://web.archive.org/web/20070913192456/http://glossary.usstamps.org/glossary5.html to http://glossary.usstamps.org/glossary5.html

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Cheers.— InternetArchiveBot  (Report bug) 22:42, 14 September 2017 (UTC)