CHEMICALS AND CHEMICAL PREPARATIONS FOR USE IN THE OPTICAL AND ACOUSTIC INDUSTRY - NAMELY, OPTICAL CEMENT, RESINS, FLEXIBILISERS AND CATALYSTS; INFRA RED PREPARATIONS AND COATINGS - NAMELY, GERMANIUM, SILICON, CALCIUM ALUMINATE, ARSENIC TRI-SULPHIDE; ELECTRO-OPTIC AND ELECTRO-ACOUSTIC MATERIALS - NAMELY, LITHIUM NIOBATE CRYSTALS

'acoust':11,40 'alumin':29 'arsenic':30 'calcium':28 'catalyst':19 'cement':15 'chemic':1,3 'coat':24 'crystal':45 'electro':35,39 'electro-acoust':38 'electro-opt':34 'flexibilis':17 'germanium':26 'industri':12 'infra':20 'lithium':43 'materi':41 'name':13,25,42 'niobat':44 'optic':9,14,36 'prepar':4,22 'red':21 'resin':16 'silicon':27 'sulphid':33 'tri':32 'tri-sulphid':31 'use':6

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