Combined drill guide and inspection device

Claim 1

A COMBINED DRILLING GUIDE AND INSPECTION READ-OUT DEVICE FOR SYSTEMS OF THE PERFORATED MATRIX CARD TYPE, COMPRISING A SUPPORT FOR HOLDING A PLURALITY OF SUPERPOSED MATRIX CARDS IN EDGE WISE ALIGNMENT, AND CARD LOCATING FORMATIONS CARRIED BY SAID SUPPORT; A RIGID BAR EXTENDING ADJACENT AND PARALLEL TO ONE OF SAID LOCATING FORMATIONS ALONG ONE LATERAL EDGE OF SAID SUPPORT, MEANS DEFINING A ROW OF TOOTH-LIKE SERRATIONS FIXED ON SAID BAR AND EXTENDING PARALLEL TO ITS LENGTH, A CURSOR SLIDABLY MOUNTED FOR MOTION ALONG SAID BAR AND HAVING AN ARM EXTENDING PERPENDICULAR TO SAID BAR SUBSTANTIALLY ACROSS SAID SUPPORT, AND A RETRACTABLE TOOTHED ELEMENT ON SAID CURSOR FOR SELECTIVE ENGAGEMENT WITH SAID SERRATIONS TO ESTABLISH THE POSITION OF SAID CURSOR ALONG SAID BAR; ONE LONGITUDINAL EDGE OF SAID CURSOR ARM BEING PROVIDED WITH SPACED SEMICIRCULAR INDENTATIONS ALONG ITS LENGTH AND A NUMERICAL SCALE CORRESPONDING TO SAID INDENTATIONS TO PROVIDE A PRECISE NUMERICAL POSITION READ-OUT FOR CARD PERFORATIONS OCCURRING ALONG THE EDGELINE OF SAID ARM; AND A ROW OF CIRCULAR DRILL-GUIDING HOLES PARALLEL TO SAID EDGE OF SAID ARM AND INWARD THEREOF, EACH HOLE BEING ALIGNED WITH ONE OF SAID INDENTATIONS AND WITH THE SUBDIVISIONS OF SAID SCALE.