Hotels, retail service, office, retail service store, food supermarket, professional office, discount store, variety store, tavern, restaurant, confectionery, shop of a plumber, electrician or similar trades person, automobile salesroom, cleaning, pressing and tailoring operations done exclusively for local and individual customers, but not including work done for the trade or for other establishments; all provided that, in the permitted stores or shops, no merchandise shall be carried other than that intended to be sold at retail on the premises, that only electric motor power shall be used for operating any machinery used incidentally to a permitted use, and that no supplies, materials or goods shall be stored outdoors.