Perforated gypsum board, specifically used only for acoustic purposes, namely, sound mitigation and sound absorption, specifically excluding wallboard and drywall, and sold to professional installers who have been trained in the nuances of installation of perforated gypsum boards

'absorpt':15 'acoust':8 'board':3,38 'drywal':20 'exclud':17 'gypsum':2,37 'instal':25,34 'mitig':12 'name':10 'nuanc':32 'perfor':1,36 'profession':24 'purpos':9 'sold':22 'sound':11,14 'specif':4,16 'train':29 'use':5 'wallboard':18

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