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7h 46min, jan 1, 1923 y - 1923-1928 (Ogino) 1929(Knaus)-Discovered relationship of ovulation within menstrual cycle separate from each other -developed calendar formulas by determining that ovulation takes place during a fixed time period
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12 Nov 2017
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NFP History
CRMS Final
Date:
7h 46min, jan 1, 1923 y
Now
~ 101 years ago