... evolved from one-coating-and-one-baking to double-coating-and-double-baking, and even three-coating-and-three-baking.4 ... , stairway, vent gutter2. Electrical appliance: refrigerator, washer, switch cabinet, instrument cabinet, air conditioning, micro-wave oven, ... quality design, purchasing raw materials, working out production plan, production, test and inspection, packaging, storage, delivering, etc. ...