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The Linotype and Intertype slugcasting typesetters produce lines of letterpress composition in a single operation, starting with the assembling of the movable matrices. The letter matrices are thin, brass 19 × 32-millimetre (0.7 × 1.3-inch) plates, with two ears and a system of 14 notches arranged in a V on the upper surface and two heels in their lower part. The letter is engraved in intaglio on the face surface; usually two copies of the same letter are superimposed (duplex matrices)—one normal, or roman, the other a variant, either italic (sloping design) or boldface (stronger design). Thus, their thickness varies ...(100 of 26569 words)