open-web non-metal trusses and open-web non-metal joists for use in construction of floors, ceilings and roofs in residential and light commercial buildings, the length of which may be cut on the job site, and marketed and sold substantially exclusively to the construction trade

'build':30 'ceil':22 'commerci':29 'construct':19,50 'cut':37 'exclus':47 'floor':21 'job':40 'joist':15 'length':32 'light':28 'market':43 'may':35 'metal':6,14 'non':5,13 'non-met':4,12 'open':2,10 'open-web':1,9 'residenti':26 'roof':24 'site':41 'sold':45 'substanti':46 'trade':51 'truss':7 'use':17 'web':3,11

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