Any person who has been engaged in the occupation, trade or business of a water well contractor within the State of Illinois prior to June 1, 1959, shall upon application within one year of the effective date of this Act and payment of the required license fee, be issued a water well contractor’s license certificate hereunder, without examination. Any person who has been engaged in the occupation, trade or business of Water Well Pump Installation Contractor within the State of Illinois for a period of twelve (12) months in the past ten (10) years prior to January 1, 1972, shall, upon application before December 31, 1972 and payment of the required fee, be issued a Water Well Pump Installation Contractor’s license hereunder without examination. The Director may require such applicant to submit satisfactory proof that he was so engaged prior to such time.