Manufacturing, assembling, repairing, compounding, fabricating, treatment of articles or merchandise from the following previously prepared material (not employing a boiling process): bone, canvas, cellophane, clay, cloth, cork, feathers, felt, fiber, fur, glass, hair, horn, leather, paint; also paper, plastics, precious or semiprecious metals or stones, shells, straw, textiles, tobacco, wood (but not including heavy woodworking shop) and yarns. (See §§ 300-75, 300-85.)