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isa:182404944
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Forehead support portion 100 can include stabilizing portions 170 (see FIG. 21), such as raised ridges or walls, slots or other structure, to engage the adjustment channel members 132 or other portions of the forehead support adjustment mechanisms 130 to provide lateral and other support to the mechanisms 130 when they are in their final folded position.
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isap:285901657
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isa:182404944