2003ISO 1724:2003 Road vehicles - Connectors for the electrical connection of towing and towed vehicles - 7-pole connector type 12 N (normal) for vehicles with 12 V nominal supply voltage
1997ISO 1724:1997 Road vehicles - Electrical connections between towing and towed vehicles with 12 V systems - 7 pole connector type 12 N (normal)
1980ISO 1724:1980 Road vehicles; Electrical connections between towing vehicles and towed vehicles with 6 or 12 V electrical equipment; Type 12 N (normal)
1975ISO 1724:1975 Title missing - Legacy paper document