| http://www.w3.org/ns/prov#value | - Such a condition is one where the sharp ends of the mouth-bow are substantiallyaligned with a patient's eyes as the mouth bow snaps back toward the patient's face, and there have been numerous reported accidents where patients have lost their eyesight as the result of just such an incident.Safety mechanisms of various types have been proposed to eliminate the hazard to a patient caused by a mouth-
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