The input end 411 of {HEAD ~ the heating mechanism} 41 is connected with {TAIL ~ a power source end} 421 and the collector of the transistor 422 
The input end 411 of { HEAD ~ the heating mechanism } 41 is connected with { TAIL ~ a power source end } 421 and the collector of the transistor 422
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH