.~ Spring form, resilient or compressible flow controller or closure
DEFINITION
Classification: 222/494
(under subclass 491) Dispensers in which the element moved by the pressure of the contents is (1) in the form of a spring, (2) is resilient, and/or (3) is compressible.
(1) Note. Rigid devices, spring biased, are in subclass 491 or other appropriate indented subclasses, but resilient or compressible devices are here (subclass 494) even though there is an additional spring bias.
SEE OR SEARCH THIS CLASS, SUBCLASS:
490, for resilient diaphragms or nipples having slits.
