An electrostatic copier having a control system wherein switches are used to detect {HEAD ~ conditions} that would lead to {TAIL ~ paper jams} 
lead to
An electrostatic copier having a control system wherein switches are used to detect { HEAD ~ conditions } that would lead to { TAIL ~ paper jams }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL