{HEAD ~ The integrated power unit} may perform {TAIL ~ either function}, and transition between functions, while affording a smaller and lighter apparatus than the total of the two units which it replaces 
{ HEAD ~ The integrated power unit } may perform { TAIL ~ either function } , and transition between functions , while affording a smaller and lighter apparatus than the total of the two units which it replaces
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL 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