{HEAD ~ The hold ring} includes a groove in a ring like shape for constituting a burr storing space at {TAIL ~ an outer periphery} thereof and is welded to the inner periphery of the socket by ultrasonic welding 
{ HEAD ~ The hold ring } includes a groove in a ring like shape for constituting a burr storing space at { TAIL ~ an outer periphery } thereof and is welded to the inner periphery of the socket by ultrasonic welding
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