unworked or semi-worked glass ceramic material for use in the manufacture of precision optical components; namely, precision optical products, optical instruments, astronomical telescopes, substrates, windows, precision machinery, bearings, gauges and fixtures and navigational systems

'astronom':24 'bear':30 'ceram':7 'compon':17 'fixtur':33 'gaug':31 'glass':6 'instrument':23 'machineri':29 'manufactur':13 'materi':8 'name':18 'navig':35 'optic':16,20,22 'precis':15,19,28 'product':21 'semi':4 'semi-work':3 'substrat':26 'system':36 'telescop':25 'unwork':1 'use':10 'window':27 'work':5

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