1949 PINC Insulators Catalog No. 49, reprinted December, 1950 by the Porcelain Insulator Corporation, Lima, New York.152 pages, very good condition. Includes information on how Pinco insulators are made (21 pages), extensive technical information on each insulator made by the company (voltage rating, various flashover voltages, wire groove dimensions, overall dimensions, catalog numbers, various arcing distances, pinhole diameter, minimum pin height, mechanical cantilever strength), pole line construction details, and more. $30 plus media mail postage.