However, the apparatus described above is not provided with a device for controlling both the temperature of {HEAD ~ the filter} and {TAIL ~ the concentration} of the nitrogen dioxide in the filter to optimum values 
However , the apparatus described above is not provided with a device for controlling both the temperature of { HEAD ~ the filter } and { TAIL ~ the concentration } of the nitrogen dioxide in the filter to optimum values
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH