(under subclass 238) Systems in which a separate material such as steam, air, water, valve grinding compounds or other chemical or physical agents are introduced into the fluent material of the system to clean parts of the system.
SEE OR SEARCH THIS CLASS, SUBCLASS:
255+, for systems having parallel discharge from plural tanks.
268, for systems with holders for solid, flaky or pulverized material to be dissolved or entrained, and see the search notes thereto.
602+, for systems having plural inflows and a single outflow, and see the search notes to subclass 602.
SEE OR SEARCH CLASS 222, Dispensing,
129+, for dispensers in which plural diverse fluids from plural sources are discharged either separately or together.
