Etchants for use in the manufacture of semi-conductors; etchants for use in the manufacture of printed circuit boards; etching solutions being acids for use in the manufacture of semiconductors and printed circuit boards; detergents for industrial use as part of manufacturing operations; fluorspar compounds for use in the manufacture of semiconductors and printed circuit boards; fluorine; chemicals for use in industry

'acid':24 'board':20,35,57 'chemic':59 'circuit':19,34,56 'compound':46 'conductor':10 'deterg':36 'etch':21 'etchant':1,11 'fluorin':58 'fluorspar':45 'industri':38,63 'manufactur':6,16,29,43,51 'oper':44 'part':41 'print':18,33,55 'semi':9 'semi-conductor':8 'semiconductor':31,53 'solut':22 'use':3,13,26,39,48,61

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