Astronomical spectrographs; Binoculars; Lenses for microscopes; Magnifying glasses; Microscope objectives; Microscopes; Optical condensers; Optical lenses; Periscopes; Photometers; Spectrograph apparatus; Stereoscopes; Telemeters; Telescopes; Telescopic sights for artillery; Educational apparatus, namely, manipulative blocks used as teaching aids for the visualization of math concepts; Inspection mirrors; Optical inspection apparatus; Protective eye pieces; Safety goggles; Surveying machines and instruments

'aid':35 'apparatus':19,28,46 'artilleri':26 'astronom':1 'binocular':3 'block':31 'concept':41 'condens':13 'educ':27 'eye':48 'glass':8 'goggl':51 'inspect':42,45 'instrument':55 'lens':4,15 'machin':53 'magnifi':7 'manipul':30 'math':40 'microscop':6,9,11 'mirror':43 'name':29 'object':10 'optic':12,14,44 'periscop':16 'photomet':17 'piec':49 'protect':47 'safeti':50 'sight':24 'spectrograph':2,18 'stereoscop':20 'survey':52 'teach':34 'telemet':21 'telescop':22,23 'use':32 'visual':38

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