Filling opening 9 is then closed, and microwave generators 12 are operated so that {HEAD ~ the coal charge} 11 is exposed to {TAIL ~ sufficient microwave radiation}, preferably at a frequency of from twenty to 3000 MHz, to transform the coal charge into hot coke 
Filling opening 9 is then closed , and microwave generators 12 are operated so that { HEAD ~ the coal charge } 11 is exposed to { TAIL ~ sufficient microwave radiation } , preferably at a frequency of from twenty to 3000 MHz , to transform the coal charge into hot coke
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL 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