The transmission ratio is controlled by feeding an actual transmission ratio back to an input of a control circuit for the transmission ratio on a basis of a control mechanism with reference to a desired transmission ratio by {HEAD ~ adjustment} of {TAIL ~ a holding force} of the pivot bearing configuration or its adjustment path 
The transmission ratio is controlled by feeding an actual transmission ratio back to an input of a control circuit for the transmission ratio on a basis of a control mechanism with reference to a desired transmission ratio by { HEAD ~ adjustment } of { TAIL ~ a holding force } of the pivot bearing configuration or its adjustment path
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