Shooting galleries and penny or picture arcades wherein coin-operated machines, such as pool tables, pong machines, pinball machines or other similar coin-operated and amusement game machines, are maintained, except that the above-described machines may be permitted in any established business as permitted in the district as follows: Each store or location with a square footage of 10,000 square feet or less shall be permitted two amusement devices, and one additional amusement device shall be allowed for each additional 10,000 square feet of store space. Notwithstanding the foregoing, liquor-dispensing establishments licensed by the New York State Liquor Authority shall be permitted one amusement device for each 500 square feet of store space.