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Blind level

    0.02 sec.
(Mining) a level or drainage gallery which has a vertical shaft at each end, and acts as an inverted siphon.

See also: Blind



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We are particularly encouraged by the decrease, following monthly treatment, in the proportion of patients with vision at the legally blind level of 20/200 or worse, as well as the proportion of patients whose vision improved to 20/40 or better," said George D.
 
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