http://www.eskimo.com/~jlubin/disabled/vent/speakingvalves.htm
Two types of Passy-Muir and one that I got when I was in the hospital.
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Jim Lubin jlubin(AT)eskimo.com
Bothell, WA, USA <http://www.eskimo.com/~jlubin>
disAbility Resources: <http://www.eskimo.com/~jlubin/disabled>