All persons, partnerships, corporations or entities which presently own any garbage trucks, refuse trucks or similar vehicles shall not house, store or garage any more vehicles within a B or C District than the number that they presently own or are limited to. No other person, partnership, corporation or entity shall be allowed in the future to house, store or garage in a B or C District any garbage trucks, refuse trucks or similar vehicles used in the garbage business, refuse business or for the collection of materials of a similar nature.