means responsive to said first and second input signals for generating the timing signals at a frequency equal to {TAIL ~ the inverter power frequency} divided by {HEAD ~ said first factor} and multiplied by said second factor 
means responsive to said first and second input signals for generating the timing signals at a frequency equal to { TAIL ~ the inverter power frequency } divided by { HEAD ~ said first factor } and multiplied by said second factor
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH