building materials; namely, a mat-like flexible covering for use underwater and assembled from hollow plastic shells which can be filled with ballast to prevent floatation and which are interconnected by ropes so that the covering can be used as a blanket to cover and protect an irregular underwater surface

'assembl':14 'ballast':24 'blanket':43 'build':1 'cover':9,37,45 'fill':22 'flexibl':8 'floatat':27 'hollow':16 'interconnect':31 'irregular':49 'like':7 'mat':6 'mat-lik':5 'materi':2 'name':3 'plastic':17 'prevent':26 'protect':47 'rope':33 'shell':18 'surfac':51 'underwat':12,50 'use':11,40

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