§ 231. Licenses, issuance of. No person or corporation shall maintain or operate any refrigerated warehouse and/or locker plant unless licensed by the commissioner. Application shall be made upon a form prescribed by the commissioner. The applicant shall satisfy the commissioner of his or her character, financial responsibility, and competency to operate a refrigerated warehouse or locker plant. The commissioner, if so satisfied, shall issue to the applicant a license or licenses which will expire on the thirtieth of September of the next odd numbered year following its issuance. Application for renewal of such license or licenses for a period of two years shall be made biennially, upon a form prescribed by the commissioner and submitted no later than thirty days prior to the expiration of the existing license or licenses.