CP, Canadian Porcelain 4.5 inch white porcelain suspension with clevis. Canadian Porcelain Company - Hamilton, Ontario Founded 1912 by Walter T. Goddard and John Alden, both from the U.S. Company was formed to manufacture porcelain insulators and fixtures for use with electricity. George Emery was hired in 1913: An association that lasted until c. 1940. [id=234888334;unique cap embossing]