To this end two drive rings concentric with the axis of rotation of the program carrier are provided, of which one revolves at a speed of {HEAD ~ one revolution} per {TAIL ~ day} and the other at one revolution per week 
per
To this end two drive rings concentric with the axis of rotation of the program carrier are provided , of which one revolves at a speed of { HEAD ~ one revolution } per { TAIL ~ day } and the other at one revolution per week
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH