M.S. Kuznetsov porcelain and faience manufacturing company's insulators were the most common low voltage pin insulators in Russia prior to October revolution of 1917. Upper shelf from left to right: UShF-1 (УШФ-1), TF-1 (ТФ-1), TF-2 (ТФ-2) Lower shelf from left to right: TF-2, UshF-3