Astronometric measuring machines and instruments; Astronomical spectrographs; Binoculars; Close-up lenses; Lenses for astrophotography; Microscopes; Microscopes and parts thereof; Oculars; Optical condensers; Optical lenses; Periscopes; Prisms for optics purposes; Refractometers; Stereoscopes; Telescopes

'astronom':6 'astronometr':1 'astrophotographi':15 'binocular':8 'close':10 'close-up':9 'condens':23 'instrument':5 'lens':12,13,25 'machin':3 'measur':2 'microscop':16,17 'ocular':21 'optic':22,24,29 'part':19 'periscop':26 'prism':27 'purpos':30 'refractomet':31 'spectrograph':7 'stereoscop':32 'telescop':33 'thereof':20

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