Mich. Comp. Laws § 408.330

Sec. 10. The commissioner may issue a temporary permit for 30 calendar days to an operator, who has previously been operating in this state on a regular or annual basis, to continue operation. An inspection of his ski lifts shall be made within 30 days from the issuance of the permit. A ski lift inspected and covered by a permit in the preceding year may operate on a temporary basis until further inspected.