A point on the contact surface of {HEAD ~ the feeler roller} which coincides with {TAIL ~ a first contact point} in a first operational setting of the second transmission linkage coincides at least approximately with a second contact point in a second operational setting of the second transmission linkage 
coincides with
A point on the contact surface of { HEAD ~ the feeler roller } which coincides with { TAIL ~ a first contact point } in a first operational setting of the second transmission linkage coincides at least approximately with a second contact point in a second operational setting of the second transmission linkage
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH