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