exposing {HEAD ~ said coal} within {TAIL ~ said coking chamber} to microwave radiation only, and thereby forming said coal into hot coke; and 
within
exposing { HEAD ~ said coal } within { TAIL ~ said coking chamber } to microwave radiation only , and thereby forming said coal into hot coke ; and
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH