| http://www.w3.org/ns/prov#value | - This is alsotrue when treating circuits boards by developing a photo-resist coating, and when further handling a printed circuit by gold-plating, silver-plating or zinc-plating.Therefore, there is a need for a process and an apparatus with which printed circuits can be developed, etched, tin-plated, silver-plated and gold-plated in a simple, economical and hygienic manner.SUMMARY OF THE INVENTIONT
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