Steam generating, boiling, cooling, drying apparatus; heat transfer facilities and their components, in particular thermal oil heaters heated using oil, gas, coal or production waste for example tree bark, sawdust, wood chips, swarf, bagasse, peanut shells, or coffee grounds, and using electric and exhaust gas heating; heat exchangers; hot gas generators for directly heating dryers using gaseous, liquid and solid fuels and combustible solid waste; controllers, filters, fittings and circulation pumps for such facilities

Optical apparatus, measuring apparatus, magnifying apparatus, spectacles and spectacle frames, lenses and magnifying glasses; prisms (for scientific purposes); concave optical mirrors; monocles, binoculars, field-glasses, telescopes, microscopes, magic lanterns, thermometers, barometers, barographs, hygrometers, aerometers, directional compasses, densimeters, ebullioscopes, anemometers, laboratory test-tubes, curvometers, tachometers, pedometers, laboratory calipers, measuring compasses, altimeters, slides for projections and films; photographic and cinematographic apparatus and instruments, their accessories and/or spare parts, teaching apparatus, none of the foregoing being conical in shape