Blades 53 55 are parallel to one another and are oriented at {TAIL ~ an angle} identical to the angle of {HEAD ~ slots} 50 52 
Blades 53 55 are parallel to one another and are oriented at { TAIL ~ an angle } identical to the angle of { HEAD ~ slots } 50 52
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH