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