Every brewer, whether located within or without New Mexico, may designate territorial limits in the state within which the brand or brands of beer manufactured by the manufacturer may be sold by wholesalers of beer to licensees. A wholesaler of beer may enter into written agreement with the manufacturer of the brand of beer to be sold by the wholesaler which sets forth the territorial limits within which the wholesaler may distribute the beer. A copy of the agreement and any amendments shall be filed with the department by the wholesaler.