WI William Pratt is less of a prat?

Which gives them 4-5 years prior to the start of the European phase of WW2 to get it sorted. Of course the magnetic exploder will probably remain a problem, but having even on average 1/3 of the torpedoes working as advertised (and I suspect the magnetic exploder won't be enough to fail 2/3 of the torpedoes) will have some quite substantial effects up to 1943.
 
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