SLIDE RULES, CALCULATING RODS, CALCULATING DISKS, DRAFTING AND LETTERING NAMEPLATES; TESTING AND MONITORING DEVICES, ESPECIALLY MATHEMATICAL, GEODETIC AND CARTOGRAPHIC INSTRUMENTS-NAMELY, PLANIMETERS, INTEGRATORS, PANTOGRAPHS, MANUALLY AND NUMERICALLY OPERATED COORDINATE PLOTTERS; COORDINATE MEASURING TABLES WITH NUMERICAL OUTPUTS, INCLUDING TWO-AND THREE-DIMENSIONAL MEASURING DEVICES; DRAFTING TABLES AND MACHINES