Original old electrical industry trade magazine ad for HI-VOLTAGE EQUIPMENT COMPANY. Main office and factory was located in Cleveland, OH.  Masterpiece of Two Engineering Fields.  Electrical and mechanical engineering joined in this Hi-Voltage Switch to produce the one new air break development in 5 years.Type S-W Voltages to 34.5 K.V. This 1936 industry magazine advertisement would display beautifully matted and framed.