Seating the valve and seaming the tube. After each tube is snipped off at the proper length, it passes to this worker who places the open and over a sleeve, and forces the valve into position right in the center of reinforcing patch. This makes doubly sure that the tube is absolutely leak-proof. When this is done, the cube can be seamed shut--the operation which is taking place here. The two ends are butted together, the sticky rubber is bonded together under pressure, and passed on to the curing molds for vulcanizing. Firestone (General), Akron, Ohio