SCIENTIFIC AND LABORATORY APPARATUS AND TESTING AND MEASURING INSTRUMENTS, NAMELY, APPARATUS AND INSTRUMENTS FOR THE DETECTION OF POLLUTION IN THE ATMOSPHERE AND IN WATER, AND IN PARTICULAR, FOR THE DETECTION OF AMOUNTS OF GASEOUS AND AQUEOUS MATERIALS IN WATER AND AIR, [ AND APPARATUS AND INSTRUMENTS FOR THE PURIFICATION TO AQUEOUS AND GASEOUS MEDIA SUBJECT TO POLLUTION OR CONTAMINATION, EMPLOYING ELECTRO-CHEMICAL FILTRATION, OXYGEN AND MECHANICAL PURIFICATION TECHNIQUES ]

'air':41 'amount':32 'apparatus':4,11,43 'aqueous':36,50 'atmospher':21 'chemic':62 'contamin':58 'detect':16,30 'electro':61 'electro-chem':60 'employ':59 'filtrat':63 'gaseous':34,52 'instrument':9,13,45 'laboratori':3 'materi':37 'measur':8 'mechan':66 'media':53 'name':10 'oxygen':64 'particular':27 'pollut':18,56 'purif':48,67 'scientif':1 'subject':54 'techniqu':68 'test':6 'water':24,39

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