scientific and laboratory glassware; namely, extractors, ampules, burets, bottles, dispensers, columns, cylinders, seals, traps, tubes, distillation heads receivers and columns, elution apparatus, joints, connectors, sockets, vessels, tubes, bubblers, reservoirs, strips, flasks, adapters, bottles, beakers, clamps, condensers, dryers, extractors, filters, reactors, funnels, stopcocks, stoppers, vials and scientific and laboratory instruments; namely, vacuum pumps, mixers