"General Maintenance (Part I): Routine Checkups, Cleaning and Lubrication." (Brooklyn, NY: Mergenthaler Linotype Company, 1942.) This is a booklet in the "Linotype Life Extension" series. Printing code: 610.25-C-U-22X.
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The copyright on this work was not renewed, 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.