Air analysis apparatus; Apparatus and instruments for conveying, distributing, transforming, storing, regulating or controlling electric current; Apparatus for testing gas, liquids and solids; Electronic components, namely, piezoelectric switches; Meteorological instruments; Scientific apparatus, namely, sensing and signaling devices for measurement and quality control of materials processing by laser; Surveying instruments; Surveying machines and instruments

'air':1 'analysi':2 'apparatus':3,4,17,32 'compon':25 'control':14,42 'convey':8 'current':16 'devic':37 'distribut':9 'electr':15 'electron':24 'gas':20 'instrument':6,30,49,53 'laser':47 'liquid':21 'machin':51 'materi':44 'measur':39 'meteorolog':29 'name':26,33 'piezoelectr':27 'process':45 'qualiti':41 'regul':12 'scientif':31 'sens':34 'signal':36 'solid':23 'store':11 'survey':48,50 'switch':28 'test':19 'transform':10

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