1999JB/T 9841-1999 Bourdon tube temperature gauge for tractors and internal combustion engines
1981NJ 238-1981 Pressure thermometers for tractors and internal combustion engines
NJ 238-1981 Pressure thermometers for tractors and internal combustion engines was changed to JB/T 9841-1999 Bourdon tube temperature gauge for tractors and internal combustion engines.