"NATIONAL BRUSH DIGEST" is subtitled "A handy reference on the subject of Brushes and Commutation...." and is " "National" Brush Digest No. 15 (Trouble-Shooting Tables)". It was published and copyrighted in 1954, 1955, 1956 and 1957 by Union Carbide and Carbon Corporation of New York, New York.
Applications Use for deburring, edge breaking and finishing. Features The nylon filaments are impregnated with silicon carbide grit. 50% to 80% more working points then the average brush.
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