The present invention relates to {HEAD ~ an improvement} of {TAIL ~ a braking structure} which is applied to a combined portion between the after mentioned kind of turning body and a base so as to provide a predetermined braking force to the turning according to the turning body combined turnably relative to the base 
The present invention relates to { HEAD ~ an improvement } of { TAIL ~ a braking structure } which is applied to a combined portion between the after mentioned kind of turning body and a base so as to provide a predetermined braking force to the turning according to the turning body combined turnably relative to the base
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