A - Human Necessities – 62 – B
Patent
A - Human Necessities
62
B
137/1.55
A62B 9/02 (2006.01) A62B 18/10 (2006.01) F16K 15/14 (2006.01)
Patent
CA 1300468
Abstract An exhalation valve decreases the exhalation pressure resistance through a valve by causing the moment of inertia of a flapper valve to be reduced along an axis by flattening out the curved edges of the umbrella-shaped flapper valve, thereby enabling greater ease in bending of the flapper valve.
595736
Mine Safety Appliances Company
Sim & Mcburney
LandOfFree
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