spectacles and spectacle frames, lenses and magnifying glasses; prisms (for scientific purposes); concave optical mirrors; monocles, binoculars, field-glasses, telescopes, microscopes, magic lanterns, thermometers, barometers, barographs, hygrometers, aerometers, directional compasses, densimeters, ebullioscopes, anemometers, laboratory test-tubes, curvometers, tachometers, pedometers, laboratory calipers, measuring compasses, altimeters, cameras, cinecameras, slides for projections and films

'aeromet':29 'altimet':46 'anemomet':34 'barograph':27 'baromet':26 'binocular':17 'calip':43 'camera':47 'cinecamera':48 'compass':31,45 'concav':13 'curvomet':39 'densimet':32 'direct':30 'ebullioscop':33 'field':19 'field-glass':18 'film':53 'frame':4 'glass':8,20 'hygromet':28 'laboratori':35,42 'lantern':24 'lens':5 'magic':23 'magnifi':7 'measur':44 'microscop':22 'mirror':15 'monocl':16 'optic':14 'pedomet':41 'prism':9 'project':51 'purpos':12 'scientif':11 'slide':49 'spectacl':1,3 'tachomet':40 'telescop':21 'test':37 'test-tub':36 'thermomet':25 'tube':38

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