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MACHINES, APPARATUS AND INSTRUMENTS FOR USE IN THE PRINTING GRAPHIC AND PRINTED CIRCUIT ARTS NAMELY, EXPOSING MACHINES FOR THE PRODUCTION OF PRINTING PLATES AND PRINTED CIRCUIT BOARDS, OPTICAL FILM PUNCHES, HEATING TOOLS FOR USE WITH HEAT ACTUATED ADHESIVE COATINGS, ELECTRICAL VACUUM PUMP CONTROL UNITS AND ELECTRICAL SWITCHING APPARATUS, COMPUTERS AND COMPUTER PROGRAMMES