2014JB/T 11853-2014 Reliability requirements and test methods of overhead projectors
1970JB/T 50102-1997 Transmissive projector - Reliability requirements and test methods
JB/T 50102-1997 Transmissive projector - Reliability requirements and test methods was changed to JB/T 11853-2014 Reliability requirements and test methods of overhead projectors.