1970QJ 1421-2006 Aerospace General Safety Inspection Rules
1988QJ 1421.8-1988 Detailed Rules for Safety InspectionDetailed Rules for Safety Inspection of Low-Voltage Electricity
QJ 1421.8-1988 Detailed Rules for Safety InspectionDetailed Rules for Safety Inspection of Low-Voltage Electricity was changed to QJ 1421-2006 Aerospace General Safety Inspection Rules.