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il cemento per smerigliare il rapporto sabbia 2.7 - 3 per un cemento.
the cement to sand ratio is 2.7 to 3 sand measures for each measure of cement, except in a small area of the north eastern united states where the author has found the ratio should be a maximum of two sand for each cement.
macchine per sbavare, affilare, molare, rettificare, smerigliare, levigare o altre macchine che operano per mezzo di mole, abrasivi o prodotti per lucidare, per la rifinitura dei metalli o dei cermet, diverse dalle macchine per tagliare o rifinire gli ingranaggi della voce 8461
machine tools for deburring, sharpening, grinding, honing, lapping, polishing or otherwise finishing metal or cermets by means of grinding stones, abrasives or polishing products, other than gear cutting, gear grinding or gear finishing machines of heading 8461