Compensation for disability, rehabilitation, medical benefits, or death benefits under this chapter shall be barred unless a claim is filed within 3 years after the date of injury; provided, however, that if the nature of the injury and its possible relationship to the employment are not known to the employee, the time for filing a claim shall not begin to run until the earlier of the following:
RSA 281-A:21-a
1990, 254:12, eff. Jan. 1, 1991.