means responsive to the inverter power for generating a first input signal having a frequency equal to {TAIL ~ the inverter power frequency} divided by {HEAD ~ a first factor} 
means responsive to the inverter power for generating a first input signal having a frequency equal to { TAIL ~ the inverter power frequency } divided by { HEAD ~ a first factor }
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