(under subclass 583) Systems in which one of the openings is an access opening and another is an outlet for fluid contents of the system.
(1) Note. The access opening admits tools other than those contributing to the intended operation of the device, as for cleaning or removal of parts, or allows workmen to reach into or enter the container.
(2) Note. Openings to admit an actuator or drain an actuator housing are not considered openings in the system
nor access openings for this subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
237+, for devices having openings for the introduction of cleaning fluids or claimed cleaning tools.
283+, for hydrants having removable valves and valve seats. 326, for containers having means by which a valve in the bottom can be removed through an opening in the top of the container or by which such removal is facilitated.
327+, for devices having disassembly tool engaging features.
342, for systems providing support for a workman.
364+, for valve and meter wells.
SEE OR SEARCH CLASS
251, Valves and Valve Actuation,
291+, for detachable valve actuators, and see the search notes thereto and (2) Note, above.
