Big, bulky air conditioner of the 1950s moves down an assembly line. Man in white uniform works on it. It has a red tag on it, facing us. Man stands behind the air conditioner. As it comes down the line, another man with gloves puts a grill with insulation on the side of the appliance. Man with appliance makes notes. Quality control. Several air conditioners move on the assembly line toward the camera, good movement.