I.H.C.: High performance heavy-duty coil for electronic ignition. ALLIS CHALMERS: High performance heavy duty coil. For 12 volt systems, delivers up to 40,000 volts. CASE: High performance heavy-duty coil. For 12-volt systems, delivers up to 40,000 volts. WHITE EQUIPMENT: High performance heavy-duty coil. For 12 volt systems, delivers up to 40,000 volts. FORD: High performance heavy-duty coil for 12-volt systems. Delivers up to 40,000 volts. 3 ohms resistance, for Electronic Ignition.