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If you select only a start date, you will get matches all the way up to the present.
If you select only an end date, you will get all matches up to that date.
A date range (enter both start and end) is preferable, as long as the range isn't too big, since you're more likely to get a manageable number of results.
Find cases filed in the given date range that are still open (neither closed, nor discharged, nor dismissed).