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New Manufacturing process of parts molientes or artificial, Emery, carborundum, silex, aluminium oxide or other material, Sharper than Natural StoneApplicable to the Stones of the old Mills, for grinding and Milling of EC
New Manufacturing process of parts molientes or artificial, Emery, carborundum, silex, aluminium oxide or other material, Sharper than Natural StoneApplicable to the Stones of the old Mills, for grinding and Milling of EC