[ Material testing instruments and machines, namely, microhardness testers, colorimeters, illuminometers, fluorometers and thermometers; gas testing instruments; apparatus and instruments for physics, namely, densimeters, concentration meters and actinometers; electric measuring devices, namely, conductivity meters; refractometers; optical goods, namely, sunglasses and spectacles; ] optical apparatus and instruments, namely, spectrometers [ ; photometers; electric batteries ]

'actinomet':27 'apparatus':17,42 'batteri':49 'colorimet':9 'concentr':24 'conduct':32 'densimet':23 'devic':30 'electr':28,48 'fluoromet':11 'gas':14 'good':36 'illuminomet':10 'instrument':3,16,19,44 'machin':5 'materi':1 'measur':29 'meter':25,33 'microhard':7 'name':6,22,31,37,45 'optic':35,41 'photomet':47 'physic':21 'refractomet':34 'spectacl':40 'spectromet':46 'sunglass':38 'test':2,15 'tester':8 'thermomet':13

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