SPARKS, Circuit Judge.
The patent in suit relates to improvements in respirators. Its object was to produce a respirator particularly adapted to enable egress through noxious vapors, such as smoke in case of fire, and one that was ever ready for instantaneous use without inflation, by application over the mouth and nose of the user, and effectively conforming to the contour of the face so as to exclude smoke-charged air and other deleterious gases, and designed to...
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