(under subclass 162) Devices in which there is a valve across the bottom of the container to admit and thereafter retain fluid from the well and there is also an additional valve or openable closure in the side wall of the container for releasing the contents of the container after the container is withdrawn from the well.
SEE OR SEARCH THIS CLASS, SUBCLASS:
165, for well containers with valves or openable closures in the side walls adjacent the top of the container.
