However, the "C" revision draft introduced several key concepts that are now widely used in modern PCB design tools like those from PCB Libraries Key Technical Updates (Draft "C")
Updates in IPC-7351C Standards | PDF | Printed Circuit Board - Scribd ipc-7351c pdf
The result was catastrophic waste: re-spun circuit boards, delayed product launches, and mysterious field failures in everything from car brakes to pacemakers. However, the "C" revision draft introduced several key