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21 h 54 min, 1 juin 1935 ans - 1935-Hildebrand- German priest, first charted BBT curves (used Van de Velde's work)-created the first BBT and calendar-thermic method

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ByN. Husk
12 nov. 2017
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Date:

21 h 54 min, 1 juin 1935 ans
Maintenaint
~ Il y a 90 ans
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