This Notebook concerns companies other than the Ludlow Typograph Company which made matrices for standard Ludlow equipment. There were also companies which made nonstandard Ludlow stick and mats for them. For these, see the Third-Party Accessories [for the Ludlow] Notebooks.
National Linotype Matrix, Inc.
Service Engraving Works
Postal mats. "Reverse" (right-reading, but "white on black") type mats.
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