{HEAD ~ These manufacturing methods} produce {TAIL ~ pistons} having a significantly lower cost per unit than pistons manufactured by a machining process wherein the piston core is machined, a seal is manufactured, and the core and the seal are mated to form the finished piston 
produce
{ HEAD ~ These manufacturing methods } produce { TAIL ~ pistons } having a significantly lower cost per unit than pistons manufactured by a machining process wherein the piston core is machined , a seal is manufactured , and the core and the seal are mated to form the finished piston
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