Rechenbehelfe erleichtern die neue Methode
Konzip Empfängnisrad basierend auf den Erkenntnissen von Hermann Knaus (MUVS Archiv)
Gynodate
What looks like a table clock in an elegant casing is actually a gynaecological display instrument: that is to say, alongside the time, date and waking time, the ‘Gynodate’ also indicates, “in a discreet fashion,” the days on which one is infertile, the date of ovulation, the fertile period and the cycle.
Gynodate
The ‘love alarm clock’
