The copyright on this work was not renewed (nor was the copyright on the book it was extracted from, Linotype Keyboard Operation), as was then required. It therefore entered the public domain upon the expiration of its initial copyright. This digital reprint remains in the public domain.
"Linotype Keyboard Practice." (Brooklyn, NY: Mergenthaler Linotype Company, 1947). This booklet contains extracts from the 1940 Mergenthaler book "Linotype Keyboard Operation." It was issued in the present from in 1947 as a booklet in the series "Linotype Lifetime Extension." Printing code: 610.32-I-Z-10X.