³Ô¹Ïtv / ENGINEERING EXPLANATIONGreen PCB Solder Mask / geometry and scope1Existing baseline2Proposed grade3Affectedrequirements4Approved revisionKeep the exact material, construction and document revision together.One level of evidence does not automatically approve every other level.Conceptual illustration. Not to scale; examples are not process settings or acceptance limits.