Joel U. Adams, United States patent 1117746 (1914)
“ When the appliance is in position, the straps and the cord whereby they are joined form a continuous and closed tie band which is yoked over both shoulders and also extends across the lower part of the back to which position it is held by roller 13.Movements of the body, particularly if one-sided as for instance if me shoulder is moved, are not retarded or checked by the appliance because of the compensating action of sliding cord 15, whereby one side of the body, when required, may be given temporarily more freedom by the movement of the cord in that direction ”
