| http://www.w3.org/ns/prov#value | - BACKGROUND OF THE INVENTIONWhen manufacturing printed circuits and printed circuit boards, there is a fundamental distinction between the widespread subtractive technique, that proceeds on the basis of metal-laminated substrates or base materials and that removes coppernot required for conductor tracks by etching, and the additive technique, that proceeds on the basis of adhesive-coated substrates
|
