Rechenbehelfe erleichtern die neue Methode
Konzip Empfängnisrad basierend auf den Erkenntnissen von Hermann Knaus (MUVS Archiv)
The dangerous repercussions of the lack of oxygen due to restricted breathing “prompted me to attempt to prevent snoring, or subdue it as far as possible, using an appropriate tool, so that the flow of air to the lungs is not impeded.”