Applies to the manufacture of brick or clay products including earthenware or tiles of a structural nature. Contemplates a minor amount of blasting. Also contemplates grinding and mixing of raw materials. Includes construction or reconstruction of sheds or kilns; clay, shale or sand digging, the manufacturing of common, face, pressed or repressed building or paving bricks, wall copings, glazed or unglazed sewer or drain pipes or conduits. Refer to codes 4053 & 4062 for pottery mfg.