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Some Known Failure Patterns . The negative exponential p.d.fThe hyper-exponential or " running-in' p.d.fThe normal or 'wear-out' p.d.f. . Negative Exponential p.d.f . A very wide range of components and equipment shows that, under normal operating conditions and during their normal operating life do not reach a point of wear-out failure at some likely time that could be called "old age".However, they are likely to fail in a given week shortly after installation as in a given week many mo9454
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