vibrantly colored c. 1930's original and intact product trade or business heavy gauge steel porcelain enameled sign designed and fabricated for the national rubber manufacturers ltd., akron, oh. the single-sided sign features a striking black and white business logo depicting a power transmission belt. national rubber manufacturers ltd. (nrm) was engaged in the field of industrial products including conveyor belts, transmission belta, hoses, v-belts, etc. the industrial belt company operated out of akron, oh. the sign was manufactured by the sur enamel co. measures 18 x 30 inches.