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pcb - How to determine annular ring width for thru-hole pads? - Electrical Engineering Stack Exchange
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Annular Ring in Flex PCBs & Via Annular Ring by Best Technology
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Annular Rings and Multilayer PCB Design: Stay Within Your Tolerances | PCB Design Blog | Altium
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.bmp "Profiants Technologies Ltd.: Drill & Annular rings")
Profiants Technologies Ltd.: Drill & Annular rings
