NASA NTRS · 19840000388
Edge Labels for Multilayer Circuit Boards
Abstract
Quick visual inspection identifies out-of-place layers. Small copper pads or other labels on layers present regular pattern if multilayer circuit board properly assembled and irregular pattern if one or more layers in wrong place. New method faster, cheaper, and more reliable than earlier methods.
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Rossi, P. J.. 1985-04-01. Edge Labels for Multilayer Circuit Boards. https://ntrs.nasa.gov/citations/19840000388
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