less { hop { filter_eq { all_rows ; successor ; john parker hale ( r ) } ; date of successors formal installation } ; hop { filter_eq { all_rows ; successor ; william bigler ( d ) } ; date of successors formal installation } } = true
select the rows whose successor record fuzzily matches to john parker hale  r  . take the date of successors formal installation record of this row . select the rows whose successor record fuzzily matches to william bigler  d  . take the date of successors formal installation record of this row . the first record is less than the second record .