23 MACHINERY FOR THE GRAPHIC ARTS-NAMELY, ETCHING MACHINES; PRINTING PROOF PRESSES; BENDING MACHINES; WHIRLERS; ROUTERS AND METAL-CUTTING GUILLOTINES FOR PRINTING PLATES; WASH-OUT MACHINES FOR PHOTOENGRAVING; ACID DISPENSING SYSTEMS FOR PHOTOENGRAVING PLANTS COMPUISING STORAGE CONTAINERS, PUMPS, VALVES AND PIPES SOLD AS A UNIT; ACID BATH NEUTRALIZING UNITS; AND COMBINATION BURN-IN COOLING UNITS FOR PHOTOENGRAVING PLATES