(57) Abstract Objective The knob which is generated with ultrasonic welding construction at the time of assembly jobMelting junction with 4 and cover 3 is prevented and yield rate improves,ru. Constitution Knob 4 of back of the cover 3 in Sliding contact surface sheetThe play which was created from thermosetting metaplasia resin such as phenol resinto 6 is padded.
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