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1. Rugged Insulators, Catalog No. 4

Description:
64-page illustrated Jeffery-Dewitt Insulator Co. trade catalog. Contents include common causes of insulator failure, manufacturing methods and routine tests, suspension and strain insulators, post type insulators, and foreign installations.
Date Issued:
1923-01-01T00:00:00Z
Data Provider:
Detroit Historical Society
Collection:
Champion Spark Plug Co.

2. Rugged Insulators, Catalog No. 4

Description:
64-page illustrated Jeffery-Dewitt Insulator Co. trade catalog. Contents include common causes of insulator failure, manufacturing methods and routine tests, suspension and strain insulators, post type insulators, and foreign installations.
Date Issued:
1923-01-01T00:00:00Z
Data Provider:
Detroit Historical Society