"' Printed circuit board milling "'( also : isolation milling ) is the process of removing areas of copper from a sheet of printed circuit board material to recreate the pads, signal traces and structures according to patterns from a digital circuit board plan known as a " layout file ".
12.
A number of these vans must be kept in service also for investigating reports of illegal transmitters ( including British GPO monopoly control of broadcasting my complaint about interference to TV reception was met by visits by an enthusiastic engineer carrying a range of signal tracing and filtering equipment, all covered by the standard licence fee.
