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The 2 dot 25B could be used over a larger temperature range and is declared as a direct precursor of the 25C. On a short search I could not find a direct mentioning of the 3 dot 25B, but would expect that this too means that the fuze had some slight alteration included, so that it could be used over a still wider temperature range (identical arming times) but still kept the general technical limitations of delays a 25B had.
Bellifortis.
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