[Trade Journal]
Publication: Electric Railway Journal
New York, NY, United States
vol. 42, no. 11, p. 446, col. 1
Pittsburgh High-Voltage Insulator Company, Derry, Pa., has issued Catalog No. 3, illustrating and listing its high potential, clay body, mahogany glaze porcelain insulators and special pieces for electrical requirements, and describing its testing department for making potential, design and mechanical tests.
