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