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