Chemicals, namely, reference standards in the nature of pure chemicals used as a measurement base for similar substances in analytical chemistry and laboratory uses; organic and non-organic chemical calibration standards, namely, reference standards in the nature of pure chemicals used as a measurement base for similar substances used in analytical chemistry

'analyt':20,52 'base':15,46 'calibr':31 'chemic':1,10,30,41 'chemistri':21,53 'laboratori':23 'measur':14,45 'name':2,33 'natur':7,38 'non':28 'non-organ':27 'organ':25,29 'pure':9,40 'refer':3,34 'similar':17,48 'standard':4,32,35 'substanc':18,49 'use':11,24,42,50

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