In no case is a certificate holder allowed to obtain a license for more than one fire protection sprinkler contractor at a time. If the certificate holder leaves the employment of the fire protection sprinkler contractor, he shall notify the board within thirty days. The certificate holder is not eligible to obtain a license for more than one other fire protection sprinkler contractor for a period of twelve months. If the certificate holder leaves the employment of the fire protection sprinkler contractor, the contractor has six months to submit a new application on another certificate holder who is at present a full-time owner, partner, officer, or in a management position of the fire protection sprinkler contractor and be issued a new license. If the application is not received and a new license issued within the allotted time, the board shall revoke the existing license of the fire protection sprinkler contractor.