{TAIL ~ The control} provides quick response and actuates the level control to effect accurate maintenance of {HEAD ~ the required liquid level} in an air pressure control system or, for example, a variable resistance control in an electrical control system 
{ TAIL ~ The control } provides quick response and actuates the level control to effect accurate maintenance of { HEAD ~ the required liquid level } in an air pressure control system or , for example , a variable resistance control in an electrical control system
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH