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Amnion

The amnion, also called the amniotic sac, is a tough but thin membrane which holds a developing fetus until shortly before birth.

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Dynabee

... to a smaller extent by the slipping friction. The device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,3 ...