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My name is Robert DuHamel and I am the original author of this article. I am writing to declare that the article is entirely my own work except for a few minor edits by other authors. The article is based on my personal experience as a former photoengraver. I did not copy any part of the article from any other source. I have made contact with a representative of Southern Alberta Photo Engraving (photo-engraver.com) who said he is unaware of the source of the text and will arrange attribution once I show that Wikipedia is indeed the source of the material.