A common shaft 138 is connected to {HEAD ~ the ninety degree gear box} 134 at one end and to a ninety degree gear box 134a at {TAIL ~ its opposite end} 
A common shaft 138 is connected to { HEAD ~ the ninety degree gear box } 134 at one end and to a ninety degree gear box 134a at { TAIL ~ its opposite end }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL