{HEAD ~ means} for controlling opening and {TAIL ~ closing} of throttle means regulating supply of fuel to said reciprocating internal combustion engine 
{ HEAD ~ means } for controlling opening and { TAIL ~ closing } of throttle means regulating supply of fuel to said reciprocating internal combustion engine
HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH