MATHEMATICAL, SURVEYING AND CARTOGRAPHIC INSTRUMENTS, ESPECIALLY PLANIMETERS, INTEGRATORS, PANTOGRAPHS, COORDINATOGRAPHS, MEASURING AND CONTROLLING INSTRUMENTS (SUCH AS NUMERICALLY CONTROLLED DRAFTING EQUIPMENT FOR PROGRAMMING PRODUCTION SEQUENCES RELATING TO PLANE SECTIONS OF COMPLEX DOEIES, IN THE NATURE OF RIB-FRAMES FOR SHIPS' HULLS, CURVED FORMS WHICH HAVE BEEN DEVELOPED AND FAIRED BY PROCESSING ON AN ELECTRIC COMPUTER, AND MANY VARIETIES OF DRAWINGS, CHARTS AND PLANS FOR SURVEYING), AND...