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Multiple Clusters in Time, Spread Out along main

In this case, we see a couple of breaks at once in 1966, then nothing for 20 straight years, when you get four breaks at once in 1986. But then it all stops until 2007, and then 2011 and 2013. I think this one is finally getting its anode retrofit, and it'll probably outlive me.

© Roy Brander, P.Eng 2016