Slide-rules; Spectroscopes; Distance measuring apparatus; Electronic devices for measuring electric current; Electronic indicator panels; Laser rangefinders; Lasers for measuring; Length measuring gauges; Level gauges; Level measuring machines; Levelling rods; Metal detectors; Protective industrial face masks; Radar detectors; Slope indicators; Smoke detectors; Surveying instruments; Surveyors' levels; Thread counters; Tool measuring instruments

'apparatus':7 'counter':49 'current':13 'detector':33,39,43 'devic':9 'distanc':5 'electr':12 'electron':8,14 'face':36 'gaug':24,26 'indic':15,41 'industri':35 'instrument':45,52 'laser':17,19 'length':22 'level':25,27,30,47 'machin':29 'mask':37 'measur':6,11,21,23,28,51 'metal':32 'panel':16 'protect':34 'radar':38 'rangefind':18 'rod':31 'rule':3 'slide':2 'slide-rul':1 'slope':40 'smoke':42 'spectroscop':4 'survey':44 'surveyor':46 'thread':48 'tool':50

RONGSHENG -

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