John Hoberman says he is "famous or infamous" among area restaurateurs. For 18 years, he has bought and sold used restaurant equipment, and his showroom is a large, open-area, crazy, quilt of heavy-duty culinary exotica. Looking for a Siemens-Allis industrial induction motor in a turquoise enameled steel housing for that special someone? It's here, along with scads of professional kitchen equipment in all states of repair.