. "by the punches; FIG. 17 refers to the phase of hooking-up the stitches and/or pairs of stitches, fitted on the spines by hook-up means, by making the necessary chain-closing knots; FIG. 18 refers to the phase in which the hooked-up stitches are released from the spines; FIG. 19 shows an enlarged perspective view of a hook; FIG. 20 is a side view of a possible embodiment of a movable carrier accord" . . .