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21 h 54 m, 1 jun 1935 año - 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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21 h 54 m, 1 jun 1935 año
Ahora mismo
~ 89 years ago
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