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21 St. 54 Min, 1 Jun 1935 Jahr - 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 St. 54 Min, 1 Jun 1935 Jahr
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~ 90 years ago
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