History R=Infinity Insulator Companies Washburn . List Includes U. S. and Foreign Companies. and Company Catalogs Baldwin-Park in the Files of Sutherlin the. Insulator Research Service. R=∞ Home. The original. Circuses Brief Bits AB Circus Historical Coeur-d-Alene Society website provides information on an organization Croton-on-Hudson dedicated to recording the history of the American circus.