Abstract: An apparatus, method and system for verifying the accuracy of a sample of printed or other reproduced material. In the apparatus, a base is provided having a support surface for securing the reproduced sample to said surface, with a transparent support means slidably lying contiguous to the support surface. A transparent master symbol for verifying the accuracy of the reproduced material is secured to the underside of the support means so that the master symbol and reproduced sample are contiguous. Preferably, the image on said transparent master symbol is interrupted to provide open spaces to facilitate visual comparison with the reproduced sample. In operation, the sample is aligned with the master symbol to verify its accuracy. In the event that a portion of the reproduced sample and master symbol are not in alignment, the master may be moved to align said portion and the movement can be measured to determine the error in reproducing the sample.

Abstract: A graphic aid and method and system associated therewith are provided for producing aligned patterns in registry such as circuit board patterns and portions thereof. Certain features of the invention make it especially useful in fabricating multiple patterns which are discrete but in registry and in which one pattern represents a portion common with all the rest. Such a system is exemplified by two sided or multilayer circuit boards. The aid includes a diaphanous layout sheet whereon one or more sets of light absorptive pattern elements and reflective marks are arranged to conform to desired circuit patterns for the surfaces of a printed circuit board. A light absorptive background sheet is also provided and it is selectively positioned behind the layout sheet, to produce visible contrast with the reflective pattern marks thereon.