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To prevent electromagnetic interference with electric appliances such as radios and televisions, use shielded cables and connectors for connec tions. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dang