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