(under subclass 450) Device wherein the feature involves means which bears or rubs against a fixed surface with sufficient force to prevent movement of the closure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
414+, for a biased guide or slide surface which frictionally retains the closure in various positions of adjustment.
421, for a reciprocating closure having a baffle plate guided in an opening provided with friction gripping means.
428+, for a reciprocating closure in which the closure or its mounting means is provided with a spring bearing surface which frictionally detains the closure.
