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The earliest recorded barrier methods are those of stem pessaries, found in Egypt.
These stem pessaries became precursors to the modern intrauterine device.
The stem pessary, a type of occlusive pessary, was an early form of the cervical cap.
Developed from stem pessaries (where the stem held the pessary in place over the cervix), the 'stem' on these devices actually extended into the uterus itself.
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