It is not uncommon for a manufacturer to fail to disclose (voluntarily) data about defects.
“Probe Points to Nuclear Coverup,” The Wall Street Journal, December 14, 2016 B1. A supplier to the nuclear industry hid manufacturing defects and falsified records for as much as 50 years. Record falsification reportedly stopped four years ago “when oversight of quality control was removed from an internal office at the factory to a different … factory….” Concerns about a quality culture. They marked which files shouldn’t be shown to regulators.
Talk about a culture problem. Interesting case study.
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