File:Fiducial Marker PCB.JPG - Wikimedia Commons
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Working With A Manufacturer - What Are Fiducials and Why Are They Useful? — Worthington Assembly Inc.
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Making PCB with 3D Printer and permanent marker | Lamja.com
How to Make PCB Using Marker : 6 Steps (with Pictures) - Instructables
PCB Laser marker machinery | PCB Laser Marking system | PCB engraver
Better Fiducial Markers in 5 Simple Steps - Meyer Electronic Manufacturing Services
