US PATENT SUBCLASS 217 / 103
.~.~.~.~ Collapsible
Current as of: June, 1999
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DEFINITION
Classification: 217/103
(under subclass 100) Subject matter in which the valve consists of a collapsible tube normally closed.
SEE OR SEARCH CLASS
137, Fluid Handling,
844+, for collapsible valves, per se.