The copyright on this work was not renewed (nor was the copyright on the work from which it was excerpted), 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 Lubrication." (Brooklyn, NY: Mergenthaler Linotype Company, 1945. Printing code 610.19-I-X-2X (which dates it to September 1945 by the Mergenthaler coding of dates in their printing codes).
This material appeared originally in the book "Linotype Machine Principles" (1940), which is online at linotype.org . It was later reprinted in a booklet in the "Linotype Life Extension" series: "General Maintenance (Part I): Routine Checkups, Cleaning and Lubrication" (Brooklyn, NY: Mergenthaler Linotype Company, 1942), which is available on The Internet Archive at: https://archive.org/details/LinotypeGeneralMaintenancePartI
This present reprint is from a different scan of its presentation as the booklet "Linotype Lubrication" (which was not officially part of the "Linotype Life Extension" series of booklets).